I prefer the Walk-N-Water Pet Canteen to all the other canteens I've tried. It has a flat design so it lies flat against your body when hiking and doesn't bounce around. It holds a liter of water, which is usually enough for most hikes. The dog drinks from a separate bowl that is attached to the canteen, so you can drink some water too.

Pros: Comfortable to carry

Cons: None

I like the convenience of the walk and water canteen. The bowl is attached so there is only 1 piece to carry. It detaches and reattaches very easily. It is large enough to hold enough water for most hikes without being to large and heavy. The carrying strap makes it easy to carry over your shoulder and it has held up well for the time we have had it. I recommend it for anyone who likes to take their dog hiking. I also took it with me to training class to allow my dogs to have a drink during breaks.

Pros: bowl attaches to water canteen

Cons: none