WATERFLY Large 60L Lightweight Water Resistant Travel Backpack/foldable & Packable Hiking Daypack (blue-40, 40L) Adjustable Bearing System: With back steel holders, adjustable straps and moveable velcro waist pad, the padded shoulder straps can be adjusted up and down freely according to your need to maximum reduce your shoulder and back pressure Ultra-Light Material: Made of ultra-light 420D nylon material, this backpack is lighter than ordinary similar ones, while it is water-resistant, wear resistant and moisture proof, perfect for outdoors Multiple Compartments: Apart from the big main pouch, top cover pockets, side water bottle mesh pockets and bottom rain cover pouch, there are 2 separate zipper side pockets and a sleeping bag pouch, as well as functional outside hanging system for trekking pole, tents, etc., ideal for storing various necessities Interior Water Bladder Pocket: There is a deep compartment inside the main pouch for a 3L water bladder storing, along with a small hole on the top right side for water tube stretching out, convenient for water drinking Thickening Waist Pad: With a thickening mesh padded waist belt, it is breathable and protects your waist well, as well as effectively supporting the pack and distributing the weight by transferring much of the weight to hips and legs