Engineered for ultra-marathons and fast-paced adventures where speed is the name of the game, the Distance 4 Hydration Vest blends our pack suspension technology with premium materials for a tour-de-force on the trails. Featuring our Stitch-less Edge Taping Technology for superior comfort, movement, and weight reduction, the Distance 4 Hydration Vest is equipped with an innovative over the shoulder Z-Pole carry system that can be easily accessed while on the go.The harness system is constructed with side stretch panels, which gives you a more secure ride while running. Dual flask pockets fit two BD HydraPak® SoftFlasks™ which are included with the vest, while zippered chest pockets, lumbar pocket, two main back pockets and small stash pockets provide ample storage for essential supplies.Features Includes two 500ml Soft Flask BD SET (Stitchless Edge Taping) Technology for a comfortable fit 4-way Stretch Vapor Mesh for breathability and comfort Removable OTF (On The Fly) Z-pole storage for on the move access 4 fit sizes. Extra Small, Small, Medium, Large Dedicated Race ready back pocket with expandable storage BDDry™ protected device pocket with expandable storage and locking zipper Key Leash Securities pocket for valuables, with expandable storage and locking zipper. Dedicated bladder sleeve Dual sternum straps Dual locking zip chest pockets Specs Average Stock Weight: 200 g (7.05 oz) Materials: Dual 4-way Stretch Mesh; UHMWPE 100d Nylon 4mm Ripstop Volume: 4 L (244 cu in)