We bought this from REI before a backpacking trip, thinking it would be so much easier than packing a bottle plus bowl for our spaniel. Wrong! The plastic hinge broke the first night after a really minor tip-over on a rock. It broke on its own impact, which rendered the bottle completely useless. It won't open its water valve if the hinge doesn't work, so we had to unscrew it every time our dog wanted a drink. Massive pain, and a little too expensive for a one-time use. Buy a bowl.