I have the ebags cubes and have been very happy with them. I bought an original 3-size set in black to start with and then got a 3 set of only large in pink. As mcubed said, they sometimes put certain colors on sale and the pink were on sale. It just so happens to match my roll aboard so I'm good with the pink.

I use the large cubes for most clothes - tshirts, trousers, etc. The medium and small cubes gets things like underwear, socks, pajamas. Basically, all clothing goes into cubes so anything interesting that the TSA thinks they need to take a gander at can be put right on top of the cubes or into their own cube. This usually keeps my carryon from getting a full dump and rummage.