Presenting the H2OPac, the lightest VestPac yet! Weighing just 12.8oz, the only person who will know you're wearing it is the one you just left in the dust. It features our climate control 3D Airmesh in the hydration panel for unbelievable airflow and rugged elastic straps to ensure a snug fit every time. The shoulder straps are free to move side to side for a custom fit, while the waist strap is designed to be worn directly below the chest line for maximum support and comfort. The H2OPac moves with your body, eliminating any chance for bouncing or rubbing.The H2OPac includes a 1 liter, BPA free reservoir that is ready to use straight out of the box. The high flow hose and 360 degree bite valve make it easy to take a drink. A plastic clip is also included so you can position the bite valve within easy reach.The H2OPac is slim enough to wear under your jacket (without looking like Quasimodo), utilizing body heat to keep your water from freezing, even in sub-zero temperatures. The 3D Airmesh creates a layer of insulation and ventilation, keeping you dry and warm. It can even be worn underneath a large backpack.If you prefer warmer climates, the H2OPac wicks moisture away from your back providing a cooling effect. It is designed to completely drain in seconds, should you decide to take a dip, and the strap positioning makes it perfect for paddle sports.Any VestPac can be converted into an H2OPac by removing the shoulder and side straps and replacing them with a Mono Strap - Front