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. The hydration bladder is made out of TPU (thermoplastic polyurethane) and comes complete with a 45 degree Blaster bite valve, easy quick connector with Plug-n-Play and flexible non-kinking Hydraflex drink tube. The hydration system is reversible for easy cleaning and drying. The hyration bladder has a patented wide slider opening for quick filling and leak proof seal and also has RF welded seams to create superior bonds at a molecular level. The hydration blader is BPA and PVC free and is made out of FDA and EU approved materials. The hydration bladder is also dishwasher safe and is naturally Anti-fungal. This product is made by Hydrapak LLC for USWE Sports AB.