Unisex, compression-fitted vest designed with a longer back for the ultimate fit and function,Shoulders and upper back are made of power mesh for maximum breathability and ultra-light adaptable comfort,Back pocket with 1.5L capacity and right entry zipper closure designed to store jacket, essentials and valuables.,4 Front pockets fit bottles and flasks up to 20oz,Vest comes with 14oz Nathan x Hydrapak Soft Flask with tapered bottom. Bounce-free run fit. Unisex, compression-fitted vest designed with a longer back for the ultimate fit and function. Vest comes with 14oz Nathan x Hydrapak Soft Flask with tapered bottom. Front sternum and side adjustment straps are designed for a bounce-free run fit Shoulders and upper back are made of power mesh for maximum breathability and ultra-light adaptable comfort. Unisex size range that fits to adapt by two sizes: XXS-XS, S-M, L-XL and XXL Back pocket with 1.5L capacity and right entry zipper closure designed to store jacket, essentials and valuables. 4 Front pockets fit bottles and flasks up to 20oz. Storage capacity: 91.5 cu in / 1.5L. Weight w/o flask: 4.4oz / 125.4g. Weight with flask: 5.5oz / 156.6g