The Growler is perfect for those long adventures with your furry friend! Squeeze the AutoDogMug and water fills the bowl for your pup to drink, release and the remaining water returns to the bottle, not wasting a drop. If you don't want to hold your squeeze while giving your dog water, twist the lock valve to the lock position when there is water in the bowl, release your squeeze, & set the bottle down for your pup to drink. Twist the lock in the center of the bowl to render a leak-tight seal, keeping your pack dry when storing! Holds 44 ounces and comes with a carabiner for attaching to your pack.