Main material: 90% High density cotton canvas 10% PU Leather? it's a very durable backpack.. Structure: 1 Main zip pocket, 2 front zip pockets and 1 side mesh pocket. There is 1 shoulder strap.. Dimension: Approx 12"L x 18"H x 7" W. It's about 30 L. It can fits most 15 inch laptop.). Multi-purpose uses: This bag can used as duffle/handbag/suitcase/brief case when travelling. Two durable straps are in a hidden compartment to make this bag a backpack/rucksack/satchel. A detachable shoulder strap can easily turn the backpack into a messenger bag/crossbody bag/mail bag/shoulder bag. One bag offers at least three different ways of carrying.. Warranty: All of our bags have 1-YEAR WARRANTY. Any quality problems with your bag, please contact us, we will solve it.