Designed like a garment, this trail running vest lies flat and securely against the body when empty, but can carry all the gear in an accessible manner for longer runs. Features: Extra-wide chest pockets accommodate a range of items, such as the two 50 ml HydraPak® flasks included Low-profile construction fits more like a garment than a pack Active load-lifting and load-handling bungee cords allow on-the-fly adjustability around various loads Dual-adjustable sternum straps provide a customised fit Pole-carry options on both right and left sides Secure, zippered back pocket doubles as a stow sack Easily accessible side pockets provide on-the-go, out-of-the-way storage for bulky items like extra layers Chest sizes: XS: 30"‒33" Small: 34"‒37" Medium: 38"‒41" Large: 42"‒48" Dimensions: 15.5 x 16 x 0.5 in Weight: 175 g (6.2 oz) Materials: Body: 3.7-oz 200-denier 100% nylon monomesh Panels: 1.7-oz Pertex® Quantum Air 100% nylon (54% recycled) stretch taffeta with a PFC-free DWR finish (durable water repellent coating that does not contain perfluorinated chemicals) Patagonia Slope Runner Endurance Vest 3L