STAY HYDRATED ON THE GO: Lightweight hydration backpack with 2L water bladder keeps you refreshed while hiking, running, cycling, or biking. Insulated bladder pocket helps keep water cold for hours. 18L/22L of organized storage. 2-LITER WATER BLADDER INCLUDED: Durable, kink-free sip tube and push-lock cushioned bite valve ensure smooth drinking. Wide 2" opening makes adding ice and cleaning easy. Leakproof design built for long hikes, runs, and bike rides. ALL-DAY COMFORT FIT: Low-profile, athletic cut with full adjustability to fit men, women, and youth. High-density foam shoulder straps with breathable mesh covering ensure you stay comfortable on all your outdoor adventures. OUTDOOR-READY FEATURES: Weather-guarded zippers protect gear from rain and dirt. Bungee cord system secures helmets or jackets. Sewn-in rain cover, butterfly opening, and lightweight design make it perfect for rugged outdoor use. TETON PROMISE: Reach out to our amazing product support team with any questions. We're here to help you get outdoors faster and more comfortably. You can count on TETON for quality gear and exceptional service.