The MBI Xtreme Backpack contains 1,680-denier polyester to ensure long lasting durability. You can easily fit a laptop into the spacious main compartment for the morning commute or use the main compartment to keep your clothes dry during a backpacking excursion. The sternum chest strap provides a snug fit that promotes a proper walking posture on flat surfaces, as well as office building stairs. Several storage pockets allow you to organize personal items and professional documents.