The Ultimate Direction Signature Series Mountain Vest 4.0 is equipped to carry the gear that will enable successful summit bids. Every detail has been thoughtfully covered in one of the lightest vests for the volume available. Featuring 11 storage pockets for all of your needs - 2 front Bottle holsters that tighten to also carry a phone or camera, 1 front zippered storage pockets for fuel or essentials, multiple quick stash pocket, 1 large zippered back storage area. Zippered "Lat" pockets along both sides provide extra, easy to reach storage. Back compression cords keep loads from shifting and hold layers in place when on the fly. A breakthrough fit feature comes in the form of the new Comfort Cinch, which adjusts laterally while on the go over the small of your back instead of the sides. The Mountain Vest 4.0 moves with you thanks to the 4-way stretch material in key places. Unique Flex Mono Mesh and MicroMono Mesh provide weightless structure and support yet absorb little water or sweat that can weigh the Vest down while running. Redesigned trekking pole holder minimizes bounce and snaps out of the way when not in use. Includes two 500ml Ultimate Direction Body Bottles which stow up front to give you easy access to fuel on the go. Hydration bladder compatible. Emergency whistle included. Sizing at chest: SM: 23 - 32 in. / 58 - 81 cm, MD: 30 - 39 in. / 76 - 99 cm, LG: 37 - 46 in. / 94 - 117 cm. Specs: Volume Capacity: 810 in3 / 13.27 L, Weight With Bottles: 12.7 oz. / 360 g , Weight Without Bottles: 9.24 oz. / 262 g. *** Beware of imitation hydration vests that are made with cheap materials and construction, won't last and are not covered by a US warranty. ***