JanSport Big Student Backpack, Purple Night Preston Plaid. With the JanSport Big Student Classic daypack, you'll be too cool for school. This large capacity pack--with a 2100 cubic inch capacity--will easily hold all your textbooks for the day in its two main compartments. It also has a front pocket with an organizer to store your necessary gadgets and music player, and a headphone cord port. Other features include an upper zippered accessory pocket, a lower front zippered stash pocket, and a web ergo handle with reinforced hold on the top of the pack. The ergodynamic, S-curved straps relieve stress from your shoulders, and are shaped to contour the natural shape of your upper torso. They disperse the weight across your back and increase air circulation. Fabric.