The largest adidas backpacks, like the Prime, have a capacity of over 40 liters. That's plenty of space for books, binders, folders and tablets. A large adidas backpack is built for utility, with features such as separate laptop and shoe compartments, internal organizers and zip-close pockets for small items like pens and earbuds. Features like padded shoulder straps, compression straps and a chest strap with a buckle will help keep you upright and supported as you carry your gear back to school in comfort. Don't let a dirty backpack stop you from making the most of your education. Here's how to wash a backpack