This has lots of pockets and snaps and buttons and zippers. The material feels like heavy canvas. It seems like it should be very durable. It easily fit two jackets, two water bottles and sunscreen. It felt comfortable on my back. From the vendor: Scientific and Reasonable Capacity: The size of this canvas backpack is about: 11.81"L x6.69"W x17.32"H/ 30x17x44 cm, it is large enough for 15.6" laptop, and multiple pockets can make your items more organized and easier to find. Quality Material: This laptop backpack is made of high density canvas material, wear resistant and durable enough. Selection of high quality material and smooth zipper, which allows this backpack to last longer and better performance. The weight of this backpack is about: 1.87 lb/0.85 kg. Adjustable Shoulder Straps: You can adjust the length of shoulder straps to fit your body, make your daily use more comfortable. The drawstring closure design, equipped with buckle design, safeg...