Unigear Hydration Pack Backpack with 70 oz 2L Water Bladder for Running, Hiking, Cycling, Climbing, Camping, Biking (Silver) FIT PERFECTLY: pack size of 16.5 x 8 x 6.0 inch with adjustable shoulder/ chest/waist straps, will fit chest size teenagers/kids with 27" up to adults (men and women) with 50". The chest and waist straps make sure the pack does not bounce when you move. LIGHTWEIGHT & SPLASH RESISTANCE & DURABLE: Upgraded lightweight and Splash Resistance nylon with 2 Liter balder (in total 1.1 lb) to reduce your load and protect your belongs stay dry in light rain, and its double built-in waist straps improve its wear and tear resistance to ensure the packs life last longer. REPLACEABLE 2L BLADDER: Includes a 2 Liter/ 70z BPA free bladder which keeps you hydrated. Its air flow system also keeps the water fairly cool. Includes screw cap for a adding small ice cubes for cooker drink for one day hiking, cycling, running or riding. SMALL FRONT POCKET: The pack designed for RACING especially with a SMALL FRONT PACKET, it can ONLY hold an iPhone 6S plus, a bunch of keys and one or one two granola bars just like other customers said. 60 DAYS GUARANTEE: If for any reason you are not 100% satisfied with this product, please contact customer immediately, and we will refund your purchase price - no questions asked. The Leaking problem can NOT be avoided 100% even we have done 100% checking work before sending it to you. If happens, please contact us immediately, we will send you a replace bladder or give you a refund per request.