My wife and I both love packing cubes- I've written a review elsewhere on our experience with packing cubes in Europe last year.
I bought two of these for my wife and she loves these. She now has these in her drawer and likes that these keep her bras in place. She also likes the four pockets in the lid that can hold her underwear.
The only minor issue is that she keeps the lid zipped up in the drawer whereas in the medium cube she had used, she had folded the lid underneath the cube. But that's a small matter.
For travel, she thinks these will be awesome- based on our experience last year. They will come in very handy for that!
I have more than 50 packing cubes and I love them. I haven't seen a design like this from any other manufacturer. Whilst I'm not an expert, I'm an addict. So while I won't use this type of cube, I very much appreciate the innovative design.
And in the meantime, I have one of my medium cubes back! :-)