Top loading main compartment give you 1100 cubic inches of space perfect to fit all of your gear big enough for four 2-liters containers * Self Stowing Design For Easy Transport & Storage - Just Flip The Side Pocket & Stuff The Pack Inside - Only 6" x 6" x 2" When Stuffed * Reinforced & Lightweight Water Resistant Nylon Fabric Helps Keep Your Gear Dry Where Ever You Venture. Interior Pocket With Zipper To Store Keys, Phone Or Wallet * Two Mesh Side Pockets For Water Bottles Or Accessories. Double Padded Shoulder Straps Provide Comfort & Support * Great for sightseeing, hiking, biking, traveling or shopping. Volume: 1100 cubic inches or 18 liters. Dimensions: 20 x 11 x 7 or 51cm x 28 cm x 18cm. Weight: 6.5 oz or 184 grams