FITACTIC 2.5 Liter 2.5L Hydration Bladder Water Reservoir Pack for Running Cycling Hiking Backpack Bag. BPA Free & Military Class. PERFECT FIT with FITACTIC Disc Golf Backpack. Capacity: 2.5 Liter , 100% odorless, tasteless, BPA- Free TPU material. FDA Approved.SGS certification.Tightness test. Leakproof design, reliable ON/OFF switch. Easy to fill water, and be put into the backpack. Easy cleaning design, large opening and quick release. Winterized tube kits cover the hose, 40" length drink tube with 36" protective tube cover.