HappySmile Hydration Pack with 2L Backpack Hydration Bladder from, Great Waterproof Cycling Hiking Climbing Hydration Backpack for Man Woman Kids WATER RESISTANT AND DURABLE FABRIC: Waterproof nylon fabric : It is water resistant protect your stuff stay dry in medium rain. It is also durable and anti-scratch, keep your pack lasts longer. ENOUGH CAPACITY: Large capacity of more than 7 Liters, Double-layer compartments fit your 13" laptop,clothes,iPad and phone. Two side pockets and one more little pocket for even more space. COMFORTABLE AND FUNCTIONALLY: Professional backpack for camping, hiking, cycling and running. Airflow system design, keep your back cool and dry. Rather than two small pieces of fabric connecting the main body, the shoulder straps taper into a large piece. This contour create a really comfortable and snug fit. UPGRADE 2L BLADDER: No-leak 2 Liter BPA Free bladder,which keeps you hydrated. Wide mouth opening for adding ice and easy clean.Additionally, the mouth piece: Anti-microbial, taste-free, high-flow. Comes with a dust cover.We do not sell cheap bladder. 1 YEAR UNLIMITED WARRANTY - Every purchase is backed with a 100% Satisfaction Guarantee 1 Year Full Coverage No Hassle Warranty! If youre not thrilled, simply contact our customer service team and know you will receive unmatched personal assistance.