This collapsible water bottle is very handy and works quite well. The silicone material is durable and light, making it perfect for hiking because the container itself is so light. It holds just over half a liter and I plan to take this on my shorter hikes or bike rides. It's convenient to carry in or on a backpack since it has a carbiner. I really like the color. Overall, a very well thought out product and I look forward to using it in the future.In my opinion, when it comes to a product built with your health and needs in mind, you can't go wrong with this 18oz BPA Free, Collapsible/ Foldable Silicone Water Bottle. We recently used it for a Mountain Camping excursion where we were doing the Tetris car deal and had totes filled to the brim with camping supplies. We were in need of a leak proof/ collapsible water bottle to save space and this one did the trick. When in use, we especially appreciated being able to pack it away or utilize the carabiner by clipping it to our person then simply unfolding it and filling it up with water. I think the only minor complaint is that when this water bottle is completely unfolded and filled up, gravity takes place where the silicone isn't as sturdy and bends therefore, needing to hold the entire water bottle and not just the lid/rim.I got this to carry whenever I travel. I fly often, and I like having a reusable bottle I can fill up at the airport and not worry about when the airline will provide beverages. This is a great solution as it collapses into half its size to make it easy to carry. It includes a carabiner so you can hook it to any bag in case you dont want to put the bottle inside your bag. The silicon seems thick enough to be durable (not indestructible), so you get good value for your money. Recommended.I have ordered several types of space-saving water bottles, but this one is the best thus far. I wanted one for travel that did not take up too much space, did not leak, and did not leave my water tasting funky. When I first got this, I washed it twice with hot water and took it to work. I noticed an odd taste to the water, so I was really sad, but when I looked back at the description, it suggested adding lemon to the water and soaking for two hours first before use. I tried that and what do you know? All is fine now. The nicest thing about this bottle is the cap. It is attached to the bottle and it is a screw on. Very happy with this.Perfect for festivals. Worked well for me.