My son needed a drawstring backpack for school (the only kind they allow). The first one we purchased was a terrible disappointment--ripping quickly. Looking at several products, my son decided on the Adidas Alliance Sport Sackpack. He loves it.

It's cool enough for a kid in junior high, yet sturdy enough to withstand the abuse dished out by the same kid. Big enough to fit full sized folders and papers, with zippered pockets and reinforced stitching, it can accommodate all his needs.