Double seal design with a rubber gasket prevents leaks, keeps the habitat dry, and supports easy cleaning and long term use. Anti backflow protection uses a rolling ball drinking mechanism to deliver water smoothly and evenly, while preventing backflow and choking risks to ensure safe hydration. Flexible design with an open bottom accommodates irregular cage setups, encourages active play and exploration, and provides a comforting hideout for your pet. Pet friendly bottle design features a contoured fit and a uniquely curved drinking nozzle, delivering water in a natural, comfortable position, improving usability, and supporting daily hydration. Use scenarios - In standard hamster cages with uneven shelf layouts, the open bottom allows flexible placement and stable mounting. - In multi level or spacious habitats, the rolling ball mechanism provides steady water delivery from different levels with minimal spills. - When your pet seeks a quiet resting spot, the open bottom serves as a cozy hideout while the bottle remains easily accessible for hydration.