Critter Canteen provides fresh clean water anytime. Featuring a spring loaded ball bearing sipper tube to provide drip resistant operation. Free bottle hanger is packed inside the bottle. Available in 4, 8, 16 or 32 ounce sizes. Instructions for Use: Refreshingly Easy: 1. Fill It! Remove the bottle hanger, rinse bottle thoroughly and completely fill the bottle. 2. Cap It! Screw on the cap tightly and flip the bottle over. 3. Hang It! Wrap hanger around the bottle and attach the hook to the cage to lock the bottle into position.