Features Easy-to-fill OMEGA opening to reservior Hydroguard anti-microbial technology eliminates up to 99.99% of bacteria and fungus Big Bite valve offers easy drinking PureFlow delivery tube has a taste-free liner to keep water tasting fresh Liquid Capacity: 70 oz Padded CD/MP3 pocket with headphone port Secure zippered compartments Organizer Refill easily with external fillport access Low-profile design Dimensions: 17.5 in x 11.5 in x 4.4 in Cargo Capacity: 194 cu in Weight: (empty) 1.36 lbs; (filled) 5.62 lbs