The Estarer backpack is designed with precision and style. The bag is manufactured with a high-quality canvas which makes it waterproof. It includes an inbuilt USB port for charging a phone. Please noted that this backpack doesn't power itself, USB charging port only offers an easy access to charge, so you need to buy a separate power bank. It has a dimension of 12.2 x 4.7 x 17.7 inches, and it can hold a 17-inch laptop. The bag has the following compartment: 1 iPad slot, 2 small pockets and 1 mesh pocket great fit for cables, mouse, cell phone, external drive, passport or other small things. The middle large space can be used to store books, A4 file, clothes, lunch to mention only a few. The backpack comes with functional pockets such as 2 quickly access pockets on the wall of the front compartment, 6 different size mesh pockets, 6 adjustable elastic buckle, 4 card holder, 3 deep pockets, 2 pen slots and lastly 2 adjustable side pockets. Again, it has a two-way smooth zipper, breathable padded, breathable mesh pad in the back and adjustable strap max width is 2.9 inches, comfortable and relax your shoulder for long wear. The backpack serves as a multi-purpose, and it is good for any occasion.