Unigear Tactical Hydration Pack Backpack 900D with 2.5L Bladder for Hiking, Biking, Running, Walking and Climbing

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Adjustable shoulder/chest straps. Fit chest sizes from teenagers/kids with 27″ up to adults (men and women) with 50″ chest size. The chest straps make sure it doesn’t bounce when you move; Whistle buckle for emergency.
Rugged 900 Denier Polyester heavy-duty construction with PVC lining, resistant to tears and abrasion; Hands-free hydration hose with bite valve, gently biting the valve opens up the flow of water
REPLACEABLE 2.5L BLADDER: Includes a 2.5 Liter BPA free bladder which keeps you hydrated. It also keeps the water fairly cool. And include a wide screw cap so you can add ice cubes for an even cooler drink. Enough to get you through a day of hiking, cycling, running or biking.
Sleek and compact design: 19″ x 10″ x 1.5″ in size and 22 ounces in weight; Two front pockets for carry your wallet, keys, phone, towel, smalltool, perfect for hiking, running, biking, walking.
60 Day 100% Satisfaction Guarantee:If for any reason you are not 100% satisfied with this product, please contact customer service within 60 days, and we will immediately refund your purchase price – no questions asked