adidas Preston Backpack Boasting a huge capacity, the Preston Backpacks XXL size and 2 main compartments give consumers the most space for their buck. The Preston features a padded laptop sleeve for up to a 15.4'' screen, tricot-lined Media Safe pocket, side water bottle pockets, and a front zippered pocket with deluxe organization. The LoadSpring shoulder strap system and air mesh back panel will help ease the load. 3-D embroidered brandmark.