Keep hydrated, on or off the water. The NRS Hydration Pack clips directly on to the back of your PFD. Or clip on the included shoulder straps for running, hiking or any other outdoor activity. Attaches securely to the back of any PFD. Removable backpack-style shoulder straps stow in the front zippered pocket when not in use. 1.5 liter capacity holds plenty of fluid for staying hydrated during strenuous exercise. Durable outer shell material can withstand overgrown trail running, mountain bike crashes, kayak roll mishaps and most any other abuse you can manage. Padded mesh back breathes easily and stays cool and comfortable against your back.