If you've ever seen a backpack with a USB port, this is how they work and why you might consider buying one.

Those trendy backpacks with wheels let you pull the weight along the ground. But they have problems too. Many are larger than the average shoulder bag, so students are tempted to carry more than ...

It's best to pick a high-capacity power bank so you can charge your devices multiple times. Backpacks with USB ports can be especially handy when you're commuting, hiking or traveling long distances.