9. Shoe Box
You might think this list is getting obsessive with its compartmentalizing, but don't underestimate the power that is the shoe box. As someone who often travels a few months at a time, I can't tell you how annoying it is to have to paw through my suitcase to find my flip-flops or a spare pair of walking shoes. This box is awesome because it's structured, let's you fit one pair of sneakers into the case, has a separate mesh pocket for flip flops, and lets you stow flats in a pocket outside of the box.

Get it at Amazon here.