Qi Packs Hydration Backpack - Running Biking Hiking PERFECT HYDRATING SOLUTION FOR ALL OUTDOOR SPORTS ACTIVITIES - Water bladder holds 70 Oz (2L). Great for hiking, running and biking for men, women & kids. SUPERIOR FIT & COMFORT Features removable waist strap for extra stability, padded and adjustable shoulder straps for added comfort. Fits Men and Women with Chest Sizes 27" - 50". PLENTY OF STORAGE: Features 3 front zippered pockets so you can store a wallet, cell phone, clothing & snacks safely and securely. STURDY WATER CONTAINER IS PREMIUM GRADE, featuring upgraded thicker walls. It is BPA-free & holds a full 70 oz. so you won't get dehydrated on long trips. OUR GUARANTEE: If for any reason you are not 100% satisfied with your Hydration Qi Pack, please let us know and we will immediately refund your purchase price - no questions asked.