Seam tore the first time using it.

Ok product. I found they will fit a lot but won't zip to compress. I would have to pack less if I wanted to compress it. I used it for travel and most of my clothes was crushed even though I rolled them carefully. I have regular travel cubes and I think I like those better. (They don't offer great compression- they're regular travel zip around cubes).
These packing cubes don't zip open completely, so putting things in and taking things out is a pain imo. I would use this product if I were camping or backpacking with minimal clothing.
I would use regular zip around travel cubes for regular travel (easier to get in and out, can be placed in hotel drawers for easy access to clothes) and these mostly for backpacking/camping trips.

I like these better than my Eagle Creek compression bags as these seem much more durable. I like that my clothes don't accidentally get zipped into the zipper. Ignore the idiots that claim these don't help compress because they clearly don't understand how these work. They clearly make more room in your bag not to mention make it easier to find what you are looking for in your bag which is a big deal when you are on an extended trip/vacation.

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.)

I've purchased a few different packing cubes from other companies and these are hands down worth every penny you'll spend. Some cubes claim to be "waterproof" but have a mesh screen to easily identify what you packed, so that's crummy and disappointing when they arrive - not these cubes; no mesh at all so they're not letting water in that easily. The larger one is bigger than the REI Medium cube and I was able to skivy roll three long sleeves with plenty of room to spare. I'd like the option to purchase individual sizes or maybe offer a mix and match (two large cubes) - I'm in the military so I bought these to ease the frustration of living out of a duffle bag for field exercises or deployments. I'd use the larger cubes more than the smaller ones and if I order as many as I need, I'll have a bunch of small cubes floating around. The material and craftsmanship is top notch, but the more you stuff in the bags, the more challenging it can be to zip up so don't cram your entire dresser drawer in one cube. I'm a fan of originality but REI did put a sample card of what could be stored in each size cube they sell to give the customer an idea of what can be packed. Overall, it's a solid product; not disappointed and I'd recommend to anyone looking for packing cubes.