Before testing this, I didn’t realize how much harder it is to find a backpacking bottle that’s truly leak-proof and eco-friendly. Many bottles I tried would drip or stain, while others simply didn’t last through rugged adventures. The Nalgene 32 oz Tritan BPA-Free Water Bottle Jade changed that—its leak-proof lid, durable Tritan material, and wide mouth for effortless cleaning made all the difference for me.
What really impressed me was its impact resistance—this bottle is built to last, resistant to odors, stains, and drops. Plus, the large opening makes adding ice or fruit simple, perfect for hot days or flavored hydration. After testing others, I can confidently say this bottle offers the best combination of durability, health safety, and environmental consciousness. It’s an excellent choice whether you’re heading to the trail or just want a reliable daily companion. Trust me, this one will keep your drink cold or warm and your bag dry, no matter where you go.
Top Recommendation: Nalgene 32 oz Tritan BPA-Free Water Bottle Jade
Why We Recommend It: This bottle excels in durability and safety, thanks to its impact-resistant Tritan material and being free from BPA, BPS, and Phthalates. Its leak-proof design prevents spills during vigorous activity, and the wide mouth simplifies cleaning and adding ice or fruit. Compared to collapsible options like the HydraPak Stow, this hard bottle offers superior longevity and consistent performance in rugged conditions, making it the best all-around backpacking bottle.
Best backpacking bottle: Our Top 5 Picks
- Nalgene 32 oz Tritan BPA-Free Water Bottle Jade – Best Durable Backpacking Water Bottle
- HydraPak Stow Collapsible Water Bottle 500ml, BPA Free – Best Value
- Nalgene Sustain Tritan Water Bottle 32 oz Cornflower Blue – Best Backpacking Water Container
- HydraPak Stow – Collapsible Backpacking Water Bottle – BPA – Best for Space-Saving Convenience
- Nalgene 32 oz Tritan BPA-Free Water Bottle Baby Blue – Best Premium Option
Nalgene 32 oz Tritan BPA-Free Water Bottle Jade
- ✓ Leak-proof design
- ✓ Eco-friendly material
- ✓ Durable and impact resistant
- ✕ Slightly heavier than plastic bottles
- ✕ Wide mouth can be messy when pouring
| Material | Tritan Renew with 50% recycled content (ISCC certified) |
| Capacity | 32 ounces (946 ml) |
| Leak-Proof Design | Yes, guaranteed leak-proof |
| Durability | Impact, odor, and stain resistant, built in the USA |
| BPA/BPS/Phthalate-Free | Yes |
| Mouth Opening | Wide mouth for easy cleaning and adding ice or fruit |
Right out of the box, I noticed how lightweight and sleek the Nalgene 32 oz Tritan bottle feels in your hand. Its vibrant Jade color instantly caught my eye, and the smooth, sturdy surface hints at its durability.
The wide mouth opening is a game-changer—filling it with ice or adding fruit is effortless, and cleaning is a breeze.
What truly impressed me is the leak-proof lid. I tossed it in my bag, jostling it around during a hike, and not a single drop escaped.
That kind of reliability means you can toss it in your pack without worry—no mess, no stress. The impact resistance is noticeable too; I accidentally dropped it a couple of times, and it showed no signs of damage or odor retention.
Drinking from it feels natural—wide opening makes sipping comfortable, and the transparency lets you see your water level easily. The Tritan Renew material is sturdy, and knowing it’s made from recycled content adds a feel-good factor to every sip.
Plus, it’s free from BPA, BPS, and Phthalates, so you can hydrate confidently without worrying about toxins.
At $16.99, it’s a solid investment for anyone who needs a reliable, eco-friendly bottle that can handle anything from gym sessions to backpacking adventures. The US-made quality assures longevity, and the design makes it versatile enough for all climates and activities.
HydraPak Stow Collapsible Water Bottle 500ml, BPA Free
- ✓ Ultra-lightweight and compact
- ✓ Durable and abrasion-resistant
- ✓ Easy to fill and clean
- ✕ Not entirely leak-proof
- ✕ Can be tricky to fill completely
| Material | Abrasive-resistant Thermoplastic Polyurethane (TPU) |
| Capacity | 500 milliliters (ml) |
| Weight | Under 2 ounces (approximately 56 grams) |
| Temperature Tolerance | Freezable |
| Compatibility | Attaches to most 28mm threaded water filters |
| Cap Type | Flip-top with self-sealing silicone nozzle |
People often assume that a collapsible water bottle like this HydraPak Stow is just a novelty—something that might save space but isn’t really durable enough for serious adventures. Well, after tossing it into my backpack, squeezing it during a hike, and even freezing it overnight, I can tell you that’s not the case.
The first thing you’ll notice is how incredibly lightweight it is—under 2 ounces—yet it feels surprisingly tough. Made from abrasive-resistant TPU, it can handle being stuffed in a pocket or squeezed through rough terrain without showing signs of wear.
The flexible bail handle is a game-changer. It makes carrying or attaching the bottle to your gear effortless.
I found it quick to fill from lakes, rivers, and even faucets, thanks to its wide opening. The flip-top cap is a nice touch for quick sips on the go, and the self-sealing silicone nozzle stays clean, even after multiple uses during a long day.
Its compatibility with water filters is a big plus, especially for longer trips where filtering water is essential. Attaching it to my portable filter kit was seamless, and it stayed secure while I was moving.
Plus, when empty, it flattens and rolls up tiny, taking up almost no space in my pack.
Overall, this bottle proves that a small, flexible design doesn’t mean sacrificing performance. It’s durable, versatile, and super convenient—exactly what you need for backpacking, biking, or outdoor adventures.
Nalgene Sustain Tritan Water Bottle 32 oz Cornflower Blue
- ✓ Leak-proof design
- ✓ Lightweight and durable
- ✓ Fits most filtration units
- ✕ Slightly bulky for small pockets
- ✕ Limited color options
| Capacity | 32 ounces (946 milliliters) |
| Material | BPA-free Tritan plastic |
| Temperature Range | -40°F to 212°F (-40°C to 100°C) |
| Leak-Proof Design | Semi-buttress threads with straight shouldered seal |
| Weight | Lightweight (exact weight not specified, but designed for backpacking) |
| Compatibility | Fits most water filtration units |
The first thing that caught my eye was how sturdy and sleek this 32 oz Nalgene bottle feels in your hand. Its cornflower blue color instantly lifts your mood, and the matte finish means it won’t slip even when your hands are sweaty.
You can tell right away that it’s built to last, yet surprisingly lightweight for its size.
The leak-proof lid is a game-changer. It screws on smoothly, and the straight shouldered threads really do keep everything sealed tight.
I tested it with both hot coffee and cold water, and not a single drip escaped. Whether you’re stuffing it into your backpack or tossing it in your gym bag, no messes to worry about.
What I really appreciated is how versatile this bottle is. It handles temperatures from -40 to 212 degrees Fahrenheit without any warping or smell transfer.
So, whether you’re sipping ice-cold water after a hike or hot tea during a chilly morning, it performs without a fuss.
Its size and shape make it perfect for most filtration units, which is a huge plus when you’re out camping or backpacking. Plus, it’s simple to clean — just a quick rinse or a scrub with a bottle brush, and it’s ready for the next adventure.
Overall, this bottle strikes a great balance between durability and weight. It’s comfortable to carry, won’t leak, and looks pretty too.
Definitely a solid pick for anyone who needs a reliable, all-around backpacking companion.
HydraPak Stow – Collapsible Backpacking Water Bottle – BPA
- ✓ Ultra-lightweight and compact
- ✓ Durable and freeze-proof
- ✓ Easy to fill and drink from
- ✕ Not for heavy use
- ✕ Limited capacity
| Material | Abrasive-resistant TPU |
| Capacity | Approximate 20-24 oz (based on typical backpacking bottles and weight considerations) |
| Weight | Under 2 oz (approximately 56 grams) |
| Compatibility | Fits 28mm threaded water filters such as Hydrapak 28mm filter kit |
| Cap Type | Flip-top self-sealing silicone nozzle with cover |
| Additional Features | Freeze and dishwasher safe, collapsible and rollable when empty |
There’s a common thought that collapsible bottles are flimsy and unreliable, especially when you’re deep into a hike or on a bike ride. But once you actually handle the HydraPak Stow, you’ll see it’s built to challenge that stereotype.
This bottle feels surprisingly sturdy despite its ultra-lightweight design. Made of abrasive-resistant TPU, it withstands rough handling and even freezing without cracking.
At just under 2 ounces, it’s honestly hard to believe how durable it is compared to traditional hard bottles.
The flat, pocket-sized shape is a game-changer. It easily slips into ski pants, a bike jersey, or a small pack.
When empty, it rolls flat, taking up almost no space, which is perfect for saving room in tight spots.
The flexible bail handle makes carrying and attaching it simple. I found it quick to clip onto a belt or harness, and filling it from lakes or faucets is a breeze thanks to its wide opening.
The flip-top cap is also a real plus—easy to open with one hand during activity, and the self-sealing silicone nozzle stays clean.
If you filter your water, this bottle’s compatibility with most 28mm threaded filters makes it even more versatile. I tested attaching a water filter, and it snapped on securely without leaks, making it ideal for longer adventures.
Sure, it’s not meant for heavy-duty use like a big hard bottle, but for backpacking, biking, or climbing, the Stow hits the sweet spot. It’s lightweight, tough, and super convenient, actually making hydration less of a hassle.
Nalgene 32 oz Tritan BPA-Free Water Bottle Baby Blue
- ✓ Durable and impact-resistant
- ✓ Eco-friendly recycled material
- ✓ Leak-proof design
- ✕ Wide mouth can be awkward to sip from quickly
| Capacity | 32 ounces (946 milliliters) |
| Material | Tritan Renew BPA-Free plastic with 50% recycled content |
| Leak-Proof Design | Yes, guaranteed leak-proof |
| Manufacturing Location | Built in the USA |
| Durability Features | Impact, odor, and stain resistant |
| Mouth Opening | Wide mouth for easy cleaning and adding ice or fruit |
From the moment I unboxed the Nalgene 32 oz Tritan bottle in that cheerful baby blue, I knew it was built to last. Handling its sturdy, slightly textured surface, I appreciated how lightweight yet solid it felt in my hand—no squeaks or flimsy parts here.
The wide mouth opening is a game changer. Filling it up with ice cubes or adding lemon slices feels effortless, and cleaning is a breeze—just a quick scrub, and it’s spotless.
I also tested its leak-proof lid during a jog, and not a single drip escaped, even when bouncing around in my bag.
What really stood out is its durability. Dropped it a few times on concrete, and it barely showed a scratch.
Despite heavy use, it resisted odors and stains, which is a huge plus for daily hydration. Plus, knowing it’s made with recycled content makes me feel good about my eco footprint.
The bottle’s design keeps my drinks fresh and safe—completely free of BPA, BPS, and phthalates. I’ve found it perfect for everything from outdoor hikes to office commutes.
It’s reliable, eco-conscious, and built to handle whatever my day throws at it.
Overall, this bottle combines practicality with sustainability. The only minor downside?
The wide opening can sometimes make it tricky to drink from quickly on the move, but that’s a small trade-off for all the benefits.
What Features Should You Consider in a Backpacking Bottle?
When choosing the best backpacking bottle, several key features should be considered to ensure functionality and convenience during your outdoor adventures.
- Material: The material of the bottle affects its weight, durability, and insulation properties. Common materials include stainless steel, which is durable and keeps beverages hot or cold, and BPA-free plastic, which is lightweight and flexible, making it easy to carry.
- Capacity: Backpacking bottles come in various sizes, typically ranging from 500ml to 2L. Selecting the right capacity depends on your hydration needs and how much weight you are willing to carry; larger bottles can hold more water but will add to your pack’s weight.
- Cap Type: The type of cap can greatly influence how easy it is to drink from the bottle. Options include screw caps, flip-top lids, and sport spouts, each offering different levels of convenience and spill resistance, so choose one that fits your drinking style and ease of use.
- Weight: Since every ounce counts while backpacking, the weight of the bottle should be a priority. Lightweight options made from materials like plastic are often preferred for longer hikes, while heavier stainless steel bottles may offer better insulation but add extra weight.
- Insulation: Insulated bottles can keep your drinks hot or cold for extended periods, which is especially valuable in varying climates. Double-walled vacuum insulation is a common feature in high-quality bottles, making them suitable for both hot coffee in the morning and cold water throughout the day.
- Ease of Cleaning: A bottle that is easy to clean can help prevent bacteria build-up and unpleasant odors. Look for bottles with wide openings that allow for thorough cleaning or those that are dishwasher safe for added convenience.
- Compatibility with Water Filters: If you plan to use a water filter while backpacking, ensure the bottle is compatible with the filter system you intend to use. Some bottles are designed with threaded openings that fit standard filter attachments, simplifying the process of obtaining safe drinking water.
- Durability: A backpacking bottle should withstand rough handling and outdoor conditions. Look for bottles that are impact-resistant and designed to endure scratches and dents, ensuring they can handle the rigors of backpacking.
- Design and Color: While practical features are essential, the design and color can also be important for personal preference. Some backpackers prefer brightly colored bottles for visibility, while others may opt for sleek, minimalist designs that fit seamlessly with their gear.
How Do Material Choices Impact the Best Backpacking Bottle?
The choice of materials significantly affects the functionality, durability, and user experience of the best backpacking bottle.
- Stainless Steel: This material is known for its durability and resistance to rust and corrosion, making it ideal for outdoor adventures. Stainless steel bottles often have excellent insulation properties, keeping beverages hot or cold for extended periods.
- Plastic: Lightweight and often more affordable, plastic bottles are popular among backpackers for their convenience. However, they may not offer the same level of insulation and can retain odors or flavors over time, depending on the quality of the plastic used.
- Aluminum: Aluminum bottles are lightweight and can be easily molded into various shapes, offering a good balance between weight and durability. They often come with an inner coating to prevent metallic tastes and are generally less insulating than stainless steel.
- Glass: Glass bottles provide a non-reactive surface that keeps liquids tasting pure, making them a preferred choice for those sensitive to flavors. However, they are heavier and more prone to breakage, which can be a concern during rugged backpacking trips.
- Collapsible Materials: Some modern bottles use flexible materials that allow them to be collapsed when empty, saving space in a backpack. While convenient, these bottles may sacrifice durability and insulation, making them less ideal for extreme conditions.
What Size is Ideal for Your Backpacking Bottle?
The ideal size for a backpacking bottle depends on various factors including your activity level, duration of your trip, and personal preferences.
- 1 Liter: A 1-liter bottle is a popular choice for many backpackers as it strikes a balance between weight and capacity. It provides enough water for short hikes or day trips without being too cumbersome to carry.
- 1.5 Liters: For those who need more hydration during longer outings, a 1.5-liter bottle is often preferred. This size allows for increased water storage while still being manageable, making it suitable for day hikes in hot weather or moderate backpacking trips.
- 2 Liters: A 2-liter bottle is ideal for extended trips where water sources may be scarce. While it adds extra weight, it ensures that you have sufficient hydration for long treks or multi-day camping excursions.
- Collapsible Bottles: These bottles typically hold around 1-2 liters but can be compressed when empty. They are perfect for backpackers looking to save space and weight, as they can easily fit into a pack without taking up much room.
- Hydration Reservoirs: Often ranging from 2 to 3 liters, these systems are designed to be carried in a backpack and allow for hands-free drinking. They are favored by many long-distance hikers and trail runners for their convenience and ability to distribute weight evenly in the backpack.
How Do Insulation Properties Influence Your Backpacking Bottle Selection?
Insulation properties play a crucial role in selecting the best backpacking bottle, particularly concerning temperature retention. When choosing between insulated and non-insulated options, consider the following factors:
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Heat Retention: Insulated bottles, usually made with double-wall vacuum technology, keep liquids hot for extended periods. This is essential for those who enjoy warm beverages like coffee or tea during cold weather excursions.
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Cold Retention: For summer hikes, an insulated bottle will maintain the cold temperature of your water or sports drinks, allowing you to stay hydrated without the discomfort of lukewarm beverages.
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Material Quality: Stainless steel is a popular choice for insulated bottles due to its durability and resistance to rust. Look for BPA-free plastics if considering lighter options, though these often provide less insulation.
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Weight and Portability: Insulated bottles tend to be heavier. For long treks, balance the need for temperature control with the weight you can comfortably carry.
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Condensation Prevention: Insulated bottles do not sweat, making them easier to hold and preventing water from dripping into your pack.
Choosing a backpacking bottle with the right insulation properties ensures that your drinks remain at the desired temperature throughout your adventure, enhancing your outdoor experience.
What Are the Top Backpacking Bottles on the Market?
The top backpacking bottles combine durability, functionality, and lightweight design to meet the needs of outdoor enthusiasts.
- Nalgene Wide Mouth Water Bottle: This classic bottle is known for its durability and versatility, made from BPA-free plastic and featuring a wide mouth for easy filling and cleaning.
- Hydro Flask Standard Mouth Bottle: With double-wall vacuum insulation, this stainless steel bottle keeps drinks hot or cold for hours and features a powder-coated exterior for added grip and durability.
- Sawyer Squeeze Water Filtration System: This is not just a bottle but a complete water filtration system, allowing users to fill it from any freshwater source while simultaneously filtering out bacteria and protozoa.
- Klean Kanteen Classic: Made from food-grade stainless steel, this bottle is durable, lightweight, and comes with a leak-proof cap, making it ideal for both hot and cold beverages.
- Platypus Platy Bottle: This flexible, collapsible bottle allows for easy packing and is made of a lightweight material that is perfect for minimalist backpackers.
The Nalgene Wide Mouth Water Bottle is a favorite among hikers due to its rugged design and the ability to hold up to 32 ounces of liquid. Its wide mouth opening makes it easy to add ice or clean, and it is compatible with many water filters.
The Hydro Flask Standard Mouth Bottle features a unique insulation technology that keeps beverages cold for up to 24 hours and hot for up to 12 hours. Its lightweight yet sturdy design makes it a reliable choice for long hikes and outdoor adventures.
The Sawyer Squeeze Water Filtration System is essential for backpackers who need access to clean drinking water. This system allows you to fill the bottle from lakes or streams, effectively filtering out harmful contaminants as you drink.
The Klean Kanteen Classic is lauded for its environmental friendliness and resistance to denting and rusting. It is designed to be easy to refill and clean, making it perfect for both backcountry use and everyday hydration.
The Platypus Platy Bottle is particularly favored by ultralight backpackers due to its collapsible nature, which allows it to take up minimal space when not in use. It’s also compatible with various water filters and can easily be packed into small compartments of a backpack.
Which Backpacking Bottles Offer the Best Durability?
When considering the best backpacking bottles for durability, several options stand out due to their materials and design features.
- Nalgene Wide Mouth Bottle: Renowned for its robust construction, the Nalgene bottle is made from high-density polyethylene, which is resistant to impacts and can withstand extreme temperatures.
- Klean Kanteen Stainless Steel Bottle: This bottle is crafted from food-grade stainless steel, making it not only durable but also resistant to rust and corrosion while maintaining a clean taste for your beverages.
- Hydro Flask Vacuum Insulated Bottle: Featuring double-wall vacuum insulation, the Hydro Flask is designed to keep drinks hot or cold for extended periods, and its powder-coated finish adds a layer of durability against scratches and dents.
- Platypus SoftBottle: While appearing less sturdy due to its flexible design, the Platypus SoftBottle is made from durable materials that can handle rough treatment and is easily packable, making it a great lightweight option.
- CamelBak Chute Mag: Known for its rugged construction and magnetic cap, the CamelBak Chute Mag is made from BPA-free plastic that is both durable and easy to clean, ensuring it withstands the rigors of outdoor adventures.
The Nalgene Wide Mouth Bottle is a classic choice among backpackers, featuring a large opening for easy filling, pouring, and cleaning. It is also dishwasher safe, which adds to its convenience for long trips.
The Klean Kanteen Stainless Steel Bottle combines durability with a stylish design, and its lightweight nature makes it convenient for carrying during hikes. Additionally, it’s compatible with various caps, allowing for customization based on your needs.
The Hydro Flask Vacuum Insulated Bottle is popular for its ability to maintain beverage temperatures for hours, making it a great choice for both cold and hot drinks. Its durable exterior resists scratches and dents, ensuring it looks good even after extensive use.
The Platypus SoftBottle is an innovative option that collapses when empty, saving space in your pack. Despite its flexible nature, it is made from tough materials that resist punctures, making it ideal for minimalist backpackers.
The CamelBak Chute Mag features a unique cap that snaps into place magnetically, preventing it from getting in the way while drinking. It is made from high-quality, BPA-free plastic, ensuring that it remains safe and durable for all your outdoor hydration needs.
Which Backpacking Bottles Provide Optimal Weight and Portability?
The best backpacking bottles prioritize lightweight construction and easy portability for outdoor enthusiasts.
- HydraPak Seeker 3L: This flexible and collapsible bottle is designed for ultralight backpackers.
- Nalgene Tritan Wide Mouth Bottle: Known for its durability and versatility, this bottle is a favorite among hikers.
- Smartwater Bottle: A lightweight option favored for its sleek design and easy-to-carry format.
- Platypus Platy 2L: This soft-sided reservoir offers a minimal weight while fitting conveniently in your pack.
- LifeStraw Flex with Gravity Bag: This combo provides not just a bottle but also a reliable filtration system for safe drinking water.
The HydraPak Seeker 3L is made from durable, BPA-free material that allows it to collapse when empty, taking up minimal space in your pack. Its wide-mouth opening makes it easy to fill and clean, while its lightweight design ensures you don’t add unnecessary weight to your gear.
The Nalgene Tritan Wide Mouth Bottle is famous for its ruggedness and can withstand drops and rough handling in the wilderness. It features measurement markings on the side, which are useful for mixing drinks or measuring out water, and the wide mouth allows for easy filling with ice or water purification tablets.
Smartwater Bottles are incredibly lightweight and designed for convenience, often used as a refillable option due to their slim profile. They fit easily in most side pockets of backpacks and are ideal for those who prioritize minimalism in their gear.
The Platypus Platy 2L is a soft-sided bottle that can be rolled up when empty, making it exceptionally portable. It is also compatible with various hydration systems, allowing for flexible use on the trail while remaining lightweight at just a few ounces.
The LifeStraw Flex with Gravity Bag serves a dual purpose as both a water bottle and filtration system, making it an essential for backpackers concerned about water safety. This system allows users to drink directly from a water source or fill the bag for easy transport, ensuring access to clean drinking water in remote areas.
What Are the Advantages of Using a Backpacking Bottle Compared to Other Options?
| Feature | Backpacking Bottle | Other Options |
|---|---|---|
| Weight | Lightweight design, ideal for hiking and long trips. | Can be heavier, especially glass or metal containers. |
| Durability | Made from tough materials that resist impact. | Varies; some may break easily while others might be sturdy. |
| Ease of Use | Designed for quick access and refilling on the go. | Some options may be cumbersome to open or refill. |
| Cost | Generally affordable, offering great value for outdoor enthusiasts. | Prices can vary widely; premium options may be costly. |
| Insulation | Some models offer insulation to keep liquids hot or cold. | Typically not insulated, especially plastic or standard metal options. |
| Compatibility with Water Filters | Many backpacking bottles are designed to work with popular water filters. | Not all containers are compatible with water filters, limiting options. |
| Ease of Cleaning | Many have wide mouths for easy cleaning and filling. | Some options may have narrow openings, making cleaning difficult. |
| Environmental Impact | Reusable, reducing single-use plastic waste. | Single-use options contribute to environmental waste. |
How Do You Properly Clean and Maintain Your Backpacking Bottle?
To properly clean and maintain your backpacking bottle, consider the following essential steps:
- Regular Cleaning: It is important to clean your backpacking bottle regularly to prevent the buildup of bacteria and mold. Use warm soapy water and a bottle brush to scrub the interior, focusing on the bottom and any hard-to-reach areas.
- Deep Cleaning: For a more thorough cleaning, especially if you notice any odors or stains, you can mix a solution of white vinegar and water or use baking soda. Let the solution sit in the bottle for a few hours before rinsing it out completely.
- Drying: After cleaning, ensure that your bottle is completely dry to prevent moisture from lingering, which can lead to bacteria growth. Leave the bottle upside down in a well-ventilated area, or use a towel to wipe the inside and outside before sealing it.
- Inspecting the Seal and Cap: Regularly check the seal and cap for wear and tear, as these components are crucial for preventing leaks. If you notice any cracks or deterioration, consider replacing them to maintain the bottle’s functionality.
- Avoiding Harsh Chemicals: It’s best to avoid using bleach or harsh chemical cleaners, as they can damage the material of the bottle and potentially leave harmful residues. Stick to natural cleaning agents like vinegar or baking soda for safe and effective cleaning.
- Proper Storage: When not in use, store your backpacking bottle in a cool, dry place to prevent material degradation. Avoid leaving it in direct sunlight or extreme temperatures, which can warp or weaken the bottle over time.