The 5ive Star Gear Hydration Backpacks are designed with a 2.5-liter reservoir and ideal for long missions or adventures. They feature fully adjustable shoulder straps with quick-release sternum strap and easy grab handle on top and front of the bag. For close-fitting comfort and all-day hydration, this pack delivers. Item is compatible with the 5ive Star Gear 2.5L Hydration Bladder