Top positive review
So far so good. Time will tell how they hold up, but I'm optimistic!
January 10, 2018
Preface: I will update this review after I have had a chance to use these for international travel.
As you can see in the pictures they certainly do what they claim (compress your packed clothing). Perhaps the manufacturer's claims are a little optimistic in their assessment of how much and how well it does the job, but it certainly does do the job. So it's hard to complain. For reference, in the small cube, I've packed a cycling kit (including bibs, jersey, and baselayer), three pairs of boxers, gloves, and two pairs of socks. In the larger cube, I've packed four t-shirts, a pair of jeans, and three pairs of socks. I could definitely squeeze another t-shirt in the larger one. The smaller one is packed tight.
The ballistic nylon seems very good. Time will tell how well the seams will hold up, but I'm optimistic. Frankly, I'd be surprised if these weren't identical to the Eagle Creek compression cubes (re-branded, of course), but I haven't had an opportunity to compare them side-by-side.
In reference to some other reviewers' comments, I didn't have any issues zipping up the bag. That is, I didn't get any snags. I can see how one might do that if he/she wasn't careful though.
I also found that the larger cube compressed the t-shirts really well when they were properly folded (like you would put them in a drawer) rather than rolled. That's something to keep in mind. Same with the jeans. It's difficult to really fold cycling bibs, so I kind of had to just "stuff" the smaller cubes. Just keep in mind that the way these work is similar to a space bag. They compress the clothes and expel air. If you pack them full of stuff that's already compressed then it kind of defeats the purpose. You won't have any air to expel, and your compression will be minimal. So don't think you can just stuff them completely full of stuff and still get reasonable compression. If that's your goal, then just get regular cubes and stuff them full by compressing manually, as these won't really help you. (Hopefully that makes sense.)