Whenever you need a slim, space-saving design water bottle for flights or other outdoor activities, flat plastic water bottles are one of the biggest saviors for being lightweight.
Their compact shape allows them to fit into bags, pockets, or car cup holders easily. But how will you pick the one option and not regret later by choosing the wrong one?
That’s not a point worth the stress, mate! We are here to help you out. We’ve tested multiple flat plastic water bottles to bring you the top five options available. In this article, you will get the necessary information you need to make an informed and eco-friendly choice.
5 Best Flat Plastic Water Bottles
Let’s check out our top picks for the best flat plastic water bottles that combine portability, durability, and design to fit seamlessly into your busy lifestyle.
1. Tyenaza Flat Water Bottle
Key Features
- A5 paper-sized design
- Silicone-sealed cap
- Multipurpose
If you want a space-saving, easy-to-carry water bottle that’s perfect for traveling, you will love the Tyenaza flat water bottle. This 25oz water bottle saves you money as it costs only $11.
Here are the other features and benefits it has to offer you.
The bottle is made from premium AS+PS plastic, which ensures this transparent water bottle is non-toxic. It’s built to withstand a wide temperature range, from -20°C to 120°C, making it durable and versatile. Plus, its A5 paper-sized design holds a generous amount of liquid so you can stay hydrated on the go.
Its sleek, square shape looks similar to a notebook: light, slim, and sturdy. It fits easily into handbags, suitcases, school bags, backpacks, briefcases, and even larger coat pockets.
However, this isn’t a bottle you’d use in a cup holder. The flat shape doesn’t fit most.
We found the bottle completely leakproof, thanks to its silicone-sealed cap. We ran several leak tests, and it performed nicely every time. You’ll also receive two waterproof covers in different colors, so you can switch them out depending on your mood or style.
Can you carry the bottle on flights? Yes, you can take it through TSA empty, refill it at the terminal, and enjoy having extra water during the flight.
What else we love about the flat plastic water bottle is that it isn’t just for water; it’s a multipurpose container. You can use it to carry soda, juice, tea, smoothies, or even non-liquid items like snacks, sauces, salad dressings, or cold soups.
I sometimes carry travel essentials like baby food, shampoo, and conditioner in my Tyenaza flat water bottle.
One not-so-great thing about the bottle is that drying it fully can be difficult. And if you leave it damp, there’s always the worry of mold forming. So, you should wipe down as much as you can with a paper towel and let it air dry with the lid off.
Pros
- The slim, flat design saves space
- Fits easily into bags and purses
- Lightweight and convenient for travel
- Leakproof silicone-sealed cap included
- Durable, high-quality plastic material
- Reusable and temperature-resistant
- Ideal for water, juices, or snacks
- Perfect for TSA-approved travel use
Cons
- Difficult to dry completely
- Doesn’t fit standard cup holders.
Recommended: Best Insulated Plastic Water Bottle
2. HYDR Flat Plastic Water Bottle
Key Features
- Shatterproof
- BPA-free
- Dishwasher-safe
Here’s another incredible option for a flat plastic water bottle brought to you by HYDR. The bottle will make you feel like the $12 price is totally worth it.
It’s made from high-quality plastic material that’s BPA-free and completely safe to drink from. It achieved 4.9 out of 5 in our durability test. We abused the bottle in every way possible, and this shatterproof product withstood everything pretty well.
With a size of 7.5 inches tall, 4.5 inches wide, and just 1.2 inches thick, this water bottle is ultra-slim and space-saving. It fits easily into purses, backpacks, and even work totes without weighing you down.
It’s a 15oz water bottle, which may require frequent refills. However, the compactness makes it more lightweight and easier to carry. The sleek square body design prevents rolling if you set the bottle down.
A matter of annoyance is that it doesn’t fit into standard water bottle compartments on the side of most backpacks.
There’s a silicone band around the center that provides a secure, non-slip grip, even when your hands are sweaty. It adds comfort and reduces the chances of dropping the bottle during use.
The lid screws on tightly to ensure a leak-proof seal. It worked perfectly, preventing spills in my bag while I was running the leak tests. Whether you toss it into your purse or store it sideways, you don’t have to worry about leaks.
You will find the bottle easiest to clean. It’s dishwasher-safe and comes with a cleaning brush (in case you prefer hand washing your water bottle).
One downside is that when you fill the bottle with cold water, you might get condensation on the outside since it isn’t insulated. However, you can use a scarf or cloth as a barrier to keep the other bag contents dry.
Another observation is that the cap is a bit thicker than I’d like. And, although the rubber ring inside prevents leaks, it sometimes falls out when I unscrew the lid.
Pros
- The thick, durable plastic is sturdy
- Easy to clean with included brush
- Compact and slim enough for travel bags
- The silicone wrap provides a secure grip
- It doesn’t add bulk to your bag
- Lightweight and leakproof
- Perfect size for fanny packs or totes.
Cons
- The cap’s rubber ring may loosen
- Condensation can be annoying.
Recommended: Best Clear Plastic Water Bottles
3. ALLKELR Portable Flat Water Bottle
Key Features
- BPA-free
- Recyclable
- Narrow-mouth
This time, we will talk about a Tritan plastic water bottle that comes in a square and flat design to make your hydration experience safer and easier.
Tritan plastic is widely appreciated for its high quality and BPA-free characteristics. It’s completely odorless and maintains the pure taste of your water. Plus, Tritan is 100% recyclable, which makes it a great eco-friendly choice for people who want to reduce plastic waste.
We found the bottle highly durable and tough as well. This slim water bottle is highly shatter-resistant and built to handle accidental drops without breaking or cracking.
The lid screws on tightly to ensure there are no spills or leaks, even when you toss the bottle into a bag. If you prefer a narrow-mouth water bottle, this one is perfect for you. The lid has a sturdy silicone loop that makes carrying the bottle super easy. You can slip it over your wrist or attach it to a bag strap so you don’t lose it while on the move.
With dimensions of 13.8 cm (height), 7.5 cm (width), and just 3.9 cm (depth), this slim water bottle easily fits into small spaces, including your purses, backpacks, fanny packs, or even coat pockets.
It’s an 8oz water bottle, which may seem insufficient capacity for you. In that case, there are other sizing options available, such as 10.8oz and 17oz. So, pick the one that fits your hydration needs.
The only small issue is when you clean it. It’s not dishwasher-safe, so you need to hand wash it every time with a bottle brush. If you leave it to dry on the rack, it may not completely drain, and there’s always a bit of water left.
To resolve the issue, give it a quick shake over the sink and dab the rest with a towel. This shall help.
Pros
- Compact size easily fits anywhere
- The leakproof lid prevents accidental spills
- Lightweight and perfect for travel
- Durable Tritan material resists breaking
- Convenient carrying loop for hands-free use
- BPA-free, safe, and odor-free material
- Narrow mouth makes drinking spill-free
- Fits comfortably in small bags or pockets
- Clear water bottle for easy hydration tracking
Cons
- Can be tricky to clean thoroughly
- Drying fully requires extra effort.
Recommended: Best Sport Plastic Water Bottles
4. Gelible Reusable Slim Flat Water Bottle
Key Features
- BPA-free
- Narrow-mouth
- Secure lid
If you’ve been waiting for a more budget-friendly flat plastic water bottle, this $7 one can be a nice option for you. It holds up to 14.2oz liquid and comes in different colors, so you can choose one option according to your preference.
You can carry juice or any other beverage you need to stay refreshed inside the water bottle. It’s made from BPA-free plastic, which is not only durable and shatterproof but also incredibly easy to clean.
In our durability tests, we found it moderately durable, so it’s better to handle it with care.
Its rectangular design allows you to slip it easily into your pocket or bag, making it super portable for everyday use. The compact design makes it super lightweight, so you can carry it throughout your travels without feeling bulky.
The transparent body of the bottle allows you to easily see how much water is left. This helps in keeping track of your daily water intake.
It even fits in the car door pocket, which is a challenge with most bottles, especially since they don’t fit in cup holders.
The lid has a secure closure mechanism so that the water inside stays put even when you tilt or shake the bottle. This helps to prevent spills and to keep your belongings dry. We also found the lid easy to open and come with a user-friendly design.
However, it may leak if you don’t make sure the lid is tightened enough.
Cleaning can be a bit tricky for the narrow mouth of the bottle, but it will not be a deal breaker if you use a good-quality bottle brush. The bottle is not dishwasher-safe, so hand washing it protects the material.
Pros
- The leakproof lid prevents spills
- The easy-to-open design allows for quick drinking
- The durable construction ensures long-lasting use
- The clear design lets you easily monitor your water intake
- The slim and portable shape makes it convenient to carry
- It’s BPA-free and affordable
- It comes in a variety of colors
Cons
- The bottle may leak if you fail to tighten the lid properly.
Recommended: Best BPA Free Plastic Water Bottles
5. Lizbin Flat Water Bottle
Key Features
- Non-toxic material
- Reusable
- Inspiring message
Now, let’s get to know about the least expensive ($6) option on the list that offers some amazing features and benefits you can ask from a flat plastic water bottle.
This reusable water bottle is perfect for those who prefer to travel light. Its flat, square design is similar to a book, which makes it incredibly slim and easy to store. Whether you’re heading to work, a meeting, or on a trip, this compact bottle fits easily into your backpack or briefcase without taking up valuable space.
It’s made from high-quality, non-toxic plastic. And we found the bottle pretty durable. It withstands most of our abusive activities while running the durability tests. However, it doesn’t feel like a shatterproof option, so it’s better not to drop the bottle from a high altitude.
It’s odorless and maintains the freshness of the water.
The spiral design of the lid creates a tight seal, which works nicely, preventing any leaks or spills. We shook and tilted the water bottle while doing the leak tests, but it performed well, and we found no leaks.
There’s an integrated handle ring, whichprovides a comfortable and secure grip. This is especially useful during workouts or outdoor activities.
What else we love about the bottle is the inspiring message “Do Your Best” printed on it. This can serve as a daily reminder to stay positive and motivated. The bottle isn’t just functional; it also has a cute, modern design that adds a pop of color to your daily routine.
It’s a 12-oz water bottle, which I find to be enough for short-term outdoor activities. The compact design is the reason why it’s super lightweight and easy to carry.
However, the bottle is not dishwasher-safe. So, use a bottle brush and clean it thoroughly to avoid bacterial build-up.
Overall, it’s a nice product for the money you’re investing in it. By choosing this reusable water bottle, you’re helping to reduce plastic waste. It’s a sustainable alternative to disposable bottles.
Pros
- The slim and compact design fits easily
- Leak-proof cap prevents spills in bags
- Lightweight, great for travel and daily use
- The square shape fits well in small spaces
- Eco-friendly and reusable to reduce waste
- Safe, non-toxic material ensures durability
- Odorless plastic keeps drinks fresh
- Easy to carry with a hand-held ring
Cons
- The thin base can cause instability
- It can be difficult to clean if not done properly.
Recommended: Plastic Water Bottle With Flip Top Lid
How To Choose The Right Flat Plastic Water Bottle
Here’s a guide to help you consider the key factors that matter most when making your decision.
Capacity
When choosing a flat plastic water bottle, the capacity is one of the first things to think about. If you drink a lot of water throughout the day, opt for a bottle with a larger capacity, such as 25oz.
If you prefer something more compact and lightweight, choose a smaller bottle, like an 8oz-15oz version. Make sure it aligns with your hydration needs while still being portable enough for your daily activities.
Leak-Proof Features
A flat plastic water bottle should have a reliable leak-proof cap to avoid spills in your bag. When choosing the right bottle, make sure it has a secure, tightly-sealing lid.
Many models come with silicone seals or threaded caps to ensure that no water leaks out. This is especially important if you plan on carrying the bottle in a bag or backpack, where leaks can damage other items.
Material for Safety
The material of the bottle matters a lot, especially if you’re using it daily. Look for a BPA-free plastic water bottle. BPA (Bisphenol A) can be harmful, so choose a bottle made from safe, non-toxic plastic.
Many modern water bottles are made from high-quality, durable plastic like Tritan, which is both safe and long-lasting.
Durability
Since flat water bottles are often used on the go, they need to withstand drops, pressure, and general wear and tear. Choose a bottle made from shatter-resistant plastic or other materials that can handle occasional drops.
Portability
Try to get a bottle that fits easily in your backpack, gym bag, or even a small purse. Many flat bottles are designed with a slim profile, making them easier to carry and store in tight spaces. A built-in handle or carabiner can also be a great feature to add, which will allow you to attach the bottle to your bag or backpack for quick access.
Ease of Cleaning
A water bottle that’s hard to clean can become a shelter for bacteria, so choose a flat bottle with a design that makes cleaning simple.
Many bottles feature wide mouths for easy access when cleaning. You can choose a dishwasher-safe water bottle if you’re too lazy to hand wash every day. This ensures you can keep your bottle hygienic and safe to use.
Eco-Friendliness
We recommend choosing a bottle that is recyclable at the end of its life or one that is made from sustainable plastics. This way, you’re not only benefiting from the convenience of a flat bottle, but you’re also contributing to a healthier planet.
FAQs
How Often Should You Clean A Flat Plastic Water Bottle?
To maintain your water bottle’s cleanliness, be sure to wash it daily at the very least. For a thorough deep clean, sanitizing your bottle once a week or every two weeks is highly recommended.
How To Stop A Flat Plastic Water Bottle From Smelling?
Vinegar works wonders for getting rid of tough odors and baking soda naturally neutralizes smells. To freshen your bottle, add a teaspoon of baking soda, pour in hot water, shake it up, and let it sit overnight before rinsing it out.
Last Words
That’s all about the best flat plastic water bottles and how to choose them.
Make sure you select one that’s BPA-free for safety. Look for bottles with a sturdy, secure lid to prevent leaks, and opt for a bottle that suits your lifestyle. Regularly clean and sanitize your bottle to maintain hygiene and freshness. With the right choice, you’ll stay hydrated on the go.