I love the idea of cubes because esp. when you travel overseas, your luggage is subject to be opened by TSA. With these they aren't messing up your clothes. Also, you can unpack only what you need if you are going to different destinations. It's basically another way to be organized and we used them for the first time to go to Japan for 8 days. We just had carry on size luggage and all had what we needed, even with packing cold weather clothing.
We bought 4 colors to match our luggage so we could tell them apart