Super Pet Flat-Bac` Water Bottle for Dwarf Hamsters, Mice, Hamsters & Gerbils (4 oz.) Flat-Bac' Water Bottles have been specially designed to be the best quality water bottle for small animals. Every bottle comes complete with our snap-lock bracket that securely attaches the water bottle directly to any wire cage, yet is simple to detach to make refilling fast and easy. Sold separately, Super Pet's suction-cups (Item #61942) can be inserted into the snap-lock bracket allowing you to secure a Flat-Bac' water bottle inside any glass enclosure. Plus, only Flat-Bac' water bottles have the original Floating Duck refill reminder. Our 4oz. Bottle is perfect for dwarf hamsters, mice, hamsters and gerbils.