Flawless in my opinion. Insulates much better than typical bottles and is very rugged (can handle being crushed while falling on it during a trail run!). Would be nice if it had a finger loop on it so could clip to a pack, or make it easier to fast draw out of a waist pack but it's not a big deal. As a member of the Wasatach Speed Goat Mountain Racing Team, this was the only bottle I trusted at the Badwater Ultramarathon last summer; actually kept ice in it much longer than expected even at 120°F during the day!

Since I got this bottle I have been drinking more water. First of all because it is so easy to use, and the nozzle is so fun to drink out of. It does not spill or leak, and seems durable so far and I have carried it everywhere with me. It is easy to clean and keeps my water cold while I run in the sun.

Overall the bottle is very light weight and does keep liquid hot or cold longer than the conventional bottle. Would recommend to a friend based on price.

This bottle is one of the best Cycling purchases I've made (after my bike of course). It keeps your beverage of choice cold much longer than standard bottles. If i put ice in my water, there's usually still some left after an hour+ ride. The valve system works great too, no leaking if you hold it upside down, but just squeeze and it comes out eazy peazy! I own 3; everyone should own at least 1!

Great water bottle that delivers on all levels. Keeps ice nearly all day, and doesn't leak or sweat a drop. Would recommend this bottle for any type of condition or activity.

Great water bottle that delivers on all levels. Keeps ice nearly all day, and doesn't leak or sweat a drop. Would recommend this bottle for any type of condition or activity.

I bought this bottle for biking and it's perfect. My water stays colder longer. The valve is awesome and seems pretty bomb proof.

This water bottle definitely keeps my drinks cold. I love the nozzle that prevents it from leaking while packed in my bag. I would recommend this to anyone!

I love the bottle -- the insulation, valve, and positive shut-off device so it won't leak in my bag. Problem is, the drinking and valve mechanism has several parts which can trap debris and moisture and maybe develop mildew/mold; they should be disassembled occasionally for a good cleaning.

Fantastic water-bottle. Bought it based on a review on wired.com. Keeps the water cool, totally leak-proof and BPA-free. Buy it if you value the quality of water-drinking experience like I do :)

Camelbak got it right with these bottles. They are designed really well and you don't have to worry about them leaking at all. Water only comes out when you want it to come out. Pick up a set of these today!