Great for long walks, car trips, etc. Just fill the bottle and unplug the stopper, the water will fill the bowl and when your pet is done drinking, tip the bottle up and the water goes back into the bottle. These portable water bowls have a belt clip so your hands can be free when walking about town. Now available in small or large! Also available in pink, red, and blue. If you have a color preference let us know in the comment box and we will do our best to accommodate you.