The best backpacks have to pull a lot of weight. Ideally, the best backpacks can withstand a couple of school years, maybe even until graduation. The last thing you want is a school bag that goes out of style fast and leaves your back feeling sore. In sum, you want a back-to-school bag that’s in it for the long haul, and there are so many popular options these days. To help you find the best backpack, we tested popular styles from some of today’s biggest brands, including The North Face and Herschel.