1. Hydration Pack Backpack with 70 oz 2L Water Bladder for Running Hiking Cycling Climbing Camping Racing (Black)(Click Link to Check Price on Amazon) Editor's Rating : 9.6 out of 10 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 pack's life last longer.