Backpacks and Hydration Vests POC Waist Bag POC Hydro 4L Black POC 25124-1002 -30% $98.93 $141.32 POC Hydro 4L Waist Bag Black The spacious HYDRO 4L hip pack comes with a 1.5L hydration bladder. It sits comfortably and has ample storage space, making this fanny pack a loyal training partner even on long journeys. At the same time, the VPD protector provides a cushioning barrier between your back and the bag's contents in the event of a fall. Add to cart