The hydraulics? Lt hydration bladder is lightweight and easy to use. For locking the hydration bladder on your opening once folded outwards and is with the slide seal?, A Sliding Clip closure; top of the jar. Due to this construction means that the hydration bladder Easy filling and emptying, as well as complete clean. The double welded and angled chevron seams for stability and a flat profile. It also helps your the liquid under control when you go on unstable terrain. With the magnetic bite valve The Hose is perfect and stores your drink always accessible. When it's not in use, the bite valve has a simple twist lock system. The hydration bladder is made of high quality and durable, yet lightweight thermoplastic polyurethane (tpu) Material, The It With Boiling and Gefrierendem absorb water.