OGIO 122009.113 100 OZ./3 Liter Water Reservoir Bladder - For Atlas or Dakar Model Hydration Packs Slide lock, large opening accommodates ice cubes and easy cleaning after use BPA-free polyurethane film is protected by Microban antimicrobial technology OGIO Reservoir utilizes radio frequency welded seam technology on seams and exit port to ensure a strong leak-proof bond Angled easy flow bite valve provides a constant flow-rate TPU tubing is odor free and taste free