The AutoDogMug® Leak-Tight is the easiest & fastest way to keep your dog hydrated on the go or in the car! Public water bowls can contain harmful bacteria and travel water bowls are messy and inconvenient to use. 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. Now, you can twist the lock in the center of the bowl to render a leak-tight seal, keeping your backpack dry when storing! Comes with a carabiner which can attach to a pack or your belt loop.