This is unique take on the mobile dog waterer. It holds a regular sized bottle of water, and the on off lock on it makes it so you don’t have to empty it out all the time. I kept this handy when I was doing a multi-state travel over Thanksgiving. It cut down on stops, I was able to just lift it up and let him drink out of it. I have small hands, and it was very easy for me to hold. I could just unlock it, feel the bowl by tipping it, then tip it back up and lock it and put it away. No spills, no leftover water I had to dump out. Made very well, but the bowl is not overly large, so it won’t work well for a large dog, but a small or medium, it’s perfect. Also, they include 3 carbon filters, so if you are not able to access bottled water, that is a lifesaver.