This Shape-Shift hydration system adds a versatile baffle. The baffle can be zipped to slim the bladder profile and unzipped to increase fluid volume or reverse to clean and dry. The patented super-wide slide top opening makes it easy to load up with ice on hot days and turn inside out to clean when your adventure is complete. This product is made by Hydrapak LLC for USWE Sports AB Specifications:Capacity: 2,5 litre (*3,0L unzipped baffle)Material: TPU (thermoplastic polyurethane)Including: 45 degree bite valve, drink tube, Plug-N-Play connector and reusable bladderReversible for easy cleaning and dryingShape-Shift technology provides optional baffle while maintaining reversibilityConstructed with 0.25 mm thick TPU (thermoplastic polyurethane) for superior durability and flexibilityPatented wide slider opening for quick filling and leak proof sealRF welded seams to create superior bonds at a molecular levelFiltration Compatible (with Plug-N-Play connector) links with in-line water filtration optionsBPA-freePVC-freeDishwasher SafeExceeds FDA & EU regulationsNaturally Anti-fungalNo-Leak Product Warranty