New Antidote reservoir includes a lightweight, quick-seal cap, folding arms on the port to speed drying, and baffles in the body that allow the reservoir to maintain a lower profile when full New Quick Link system in reservoir allows you to quickly snap off the tube for cleaning and easily attach accessories like filters, flow meters, and insulated tubes Air Director back panel features six-pod construction that conforms to your back’s position on the bike Removable 1-inch belt with cargo pockets keeps the pack from bouncing around as you bomb downhill HydroGuard anti-microbial technology inhibits bacterial growth on reservoir and tube surfaces Ergo Hydrolock shut-off valve allows you to control water flow and prevents leaks Distance from shoulder to hip belt: 16in (40cmused USED ONE TIME! his pack is light and low-profile, you can still carry 3+ hours’ worth of water in the 3-liter Antidote reservoir, and essential tools, a snack, and your cell in the external pocket.