The half "cube" is the intermediate size of these clever travel organizers. This one is a perfect size for my purposes. It would work well for storing socks, underwear, camisoles/tanks, or women's tees.I had a lot of trouble visualizing the actual size of the Pack-It cubes using just the promo pictures and dimensions, so after trying out several sizes, I've included photos to try to provide some perspective. Here you see 3 pairs of cushioned men's crew-style dress socks and two men's boxer-briefs rolled. There's enough slack in the material to allow a layer of additional items on top. I've also pictured the half-cube (w/ same items) in a 22" carry-on sized roller suitcase.The Pack-It is a clever design that both provides structure and flexibility. The result is you can overfill the PackIt (in my pic, you could easily add another layer of items), and unless you have a solid item taking up the whole width of the bottom, there's enough extra material so the half-cube flexes to hold it all. The mesh makes it possible to compress the contents (as well as see what's in there). And the handle makes it easy to grab and carry the filled cube, which would otherwise feel sort of awkward (since it's soft-sided and flops over).Note that the half-cube is included in the sets of Eagle Creek cubes, check those out if you're going to buy multiple sizes. This half-cube is a useful size for all sorts of travelers. Recommended.