MATERIAL: This canvas backpack is made of high quality canvas with PU leather; Polyester lining; Product Dimension: Approx 12.5"L x 19.5"H x 8" W; Expansion 12.5"L x 19.5"H x 10.15" W. Weight: 1.85kg(4.06 lbs), Come with a inch duffel strap. EXPANDABLE DESIGN：Dimensions:15"L x 18.5"H x 8.3" W, dimensions after extended 19.5x13x11.5inch. You can expand the zipper according to your requirement. The duffel belt on the back allows being slide over the luggage tube,backpack very easy to carry, it is great daily travel. This backpack meets the maximum size allowed by IATA flights, can be fitted overhead and under-seat, is ideal for a weekend trip, business trip. Multi Practical Pocket Design: Product External: 6 fornt pockets（2 zippered pockets to hide the duffel handheld）, 1 side open pockets, 1 back large zip pocket, 1 main compartment; Internal structure: 2 laptop pockek + 2 open pockets + 1 large zip pocket , 1 zipper pocket on the back that hides the backpack strap to convert briefcase, duffel bag. MULTIFUNCTIONAL BACKPACK: You can easily convert this backpack into a Backpack ,Duffel Bag, Crossbody Bag, Tote Bag; This canvas rucksack come with a woven removable &adjustalbe duffel strap. The backpack straps can be hidden in the back strap pocket when you carry this bag as duffel bag,or crossbody bag or tote bag,or carry on backpack. EASY TO ORGANIZE: The travel backpack's main compartment with a laptop pocket for 12-17 inch laptop, and an Ipad pocket, and roomy space to store different travel gears. The front compartment with many various pockets can be used to store pens, keychain, and other small items for quick pick out. The travel backpack is large enough for vacation, weekend getaway, overnight trip .The travel backpack is large enough for vacation, weekend getaway, overnight trip.