Buy the Sling Bag from Topo Designs, $98

When a brand specifically makes a bag for stylishly hiking and biking through rough and rugged terrains or mountainous areas, it can probably survive your entire high school and college years of rough class schedules, crazy parties, and crowded cafeterias. The Topo Designs Sling Bag is a messenger-style camo backpack, so you can start the across-the-body backpack trend in school.