The Original PupCup lives on the bottom of your water bottle so you always have a simple and convenient way to give your hound clean, fresh drinking water without contaminating your own. It fits Nalgene, Hydroflask, Thermos, and most other 32oz to 40oz water bottles. Keep one in the car, one in your pack, and one at the office! If you have water, your hound has water. Guaranteed forever. BPA and latex free. Made in the U.S.A.