Run lighter in the Nathan Pinnacle 4L Hydration Vest. Designers built the Pinnacle vest for a second-skin fit. The low-profile pack hugs your body to keep your water and gear from bouncing around, while the lightweight fabric helps the pack breathe to keep you cool. Nathan included several pockets to organize everything you need to carry: two water-resistant pockets on the chest for a phone or other small items; side pockets that can fit gel packets; and a large rear pocket with a diagonal zipper gives you room for everything. With a redesigned back panel that better disperses weight, the Nathan Pinnacle 4L is the perfect pack for long trail runs and race days.