With an uncanny kinesthesia* sense, this is the first performance bottle vest backpack! Finally, those who love bottles can return to them wearing a revolutionary vest! With an emphasis on freedom of movement, form follows function, in this power packed race vest. Also featuring Body RhythmTM harness, this pack is built from the waist up to retain a low center of gravity for balance and control while animating the pack with motion capability that mimics the movement of a human athlete"s hips and shoulders, as opposing forces in motion. This means the pack moves multi-directionally in tandem with the wearer. Left mesh pocket over zippered inner pocket for securely stowing temperature and weather change accessories, energy foods and other necessary gear. Roomy upper back quick stash with magnetic closure designed like a bicycling jersey for quick and easy access even at full speed. *Kinesthesia relates to that sense that detects bodily position, weight, or movement of the muscles, tendons, and joints, and intuitively responds to them all.