Just got back from my first trip using these compression packing cubes.
I love them.
The size is right. I was able to get four pair of pants, some pjs and workout shorts into the large cube, which then compressed all that down. Same thing goes with shirts, undies and socks in the other cubes. I was very surprised at how this made packing and travelling so much easier. I travel for a living and really wish I had tried this out sooner. The material that makes these cubes up seems quite tough. The zippers seem strong.
So, why not five stars?
While the zippers are very solid, it is exceedingly simple to get them stuck on the material. The zippers are just a little too fine and the material of the cube is a little too loose. I found myself fighting with the zippers a lot. I adopted a very careful mechanism of keeping a finger under the zipper while compressing the cubes and still struggled a bit. I'm not sure exactly how this could be done better, but it really is a bit of a pain. The overall amazing usefulness of these cubes far outweighs this issue, but it is an issue.