As a very frequent traveler, packing cubes are a must! I use them to "modularize" my packing, making it much easier to grab only the things I need for a certain trip.  For example, business clothes are in one cube, workout clothes in another, and casual after-work clothing in yet another.  As soon as I get back, I swap in clean garments and I'm ready for the next trip, wherever the destination.

I really like the sizes of the Bago cubes. They fit well in both my carry-on bag and, for longer trips, a checked bag.  They also work great within drawers of hotel dressers to keep things organized and easy to repack. When traveling as a family, we simply use a different colour for each family member, making it much easier to share a suitcase.

I highly recommend these!