Sea To Summit says:

The Watercell X is a flexible and durable water storage and dispensing solution. Tough and versatile, Watercell X stores, transports and dispenses water wherever you need it. The 3D baffled, RF-welded TPU construction is compact and stackable, as well as BPA and PVC free. The standard 63mm wide mouth cap and integrated welded handle make filling simple and spill-free. Dispensing water is just as easy - the multi-function, low-profile cap combines flow control and includes a shower head attachment. Hang, carry and attach the Watercell X wherever your adventures take you using the welded lash points and adjustable strap.