So first off, when I travel (which is usually for a week or less), I rarely unpack my suitcase; I don't start hanging things up or using the dresser drawers. I live out of the suitcase. For my trip last week, I had to pack for cooler weather, which of course means more and heavier clothes, maybe boots, and so on. And with air travel being what it is, especially for us poor folks who travel basic economy and have to pay for the air we breathe, no carry-ons are allowed, we get hit with checked-bag fees and weight limits, etc. Therefore, I was worried that my luggage (one "carry-on" and one "under-seat/personal item"), would be an issue. I normally use Space Bags, which work very well, but the problem is that some of them require a vacuum to suck the air out, so although I could do that at home for the trip out, I knew I wouldn't have access to a vacuum when packing to come back. I considered getting one of those suitcases that becomes a "closet," but they're not cheap (and right now I'm unemployed), and honestly the luggage I have is fine. So I saw these compression organizer bags and decided to try them.There are multiple useful sizes in this bunch, they have a really nice floral design, they have a silky feel, the zippers seem very well made, and I'll jump ahead and tell you that when I got home and ran them thru the washer and dryer, they came out FINE (although the instructions say to hand wash and line dry).In the largest one, I fit the following: a pair of heavy jeans; a pair of sweat pants; 2 pairs of workout-type leggings; 5 T-shirts, a tank top, 2 long-sleeved shirts, one long-sleeved thermal shirt, 4 pairs of socks, 2 pairs of PJs, and a workout resistance band. There may have been a couple other things in there, but the point is, it literally held ALL my clothes for the week. There was no problem closing the regular zipper, or the second zipper that provides the "compression." I put that in quotes because the front of the bag has mesh, so air gets in and out, but it stayed nice and flat. With a little attention, the second (compression) zipper did fine and didn't snag the inside fabric at all, something I had heard someone complain about.In one of the smaller bags, I fit all my undergarments (so, 4 or 5 bras, 6 pairs of panties) with room to spare, and in another I put some toiletries, also with room to spare. I used another bag to put some electronic-type stuff (chargers, cables, night-lights, extension cord, etc), and coming home I used the laundry bag to re-pack all the dirty stuff, which fit quite nicely, just to keep it a little separate from the clean stuff, even though I wash everything once I get home.Going and coming home, I had room to spare in the carry-on suitcase, even with the addition of an umbrella, a pair of sneakers, a travel hairdryer, and a travel pillow, all in the main compartment. I could easily have fit another pair of shoes (or even boots) and more in there. I don't think I could have achieved this with my usual Space Bags. Before Space Bags, I used to "flat pack," but again, unless you organize your stuff in smaller bags (preferably see-through), you are going to be digging thru the entire suitcase to find the item you need. I know there are people who think rolling their clothes is the best way, but the same problem occurs; unless you put your rolled stuff into separate bags, you are going to be digging thru the suitcase to pull out what you need. Note that if you're the kind of person who unpacks on arrival, these might not be as crucial for you.Bottom line, I do think the compression aspect helps, and I do think that this particular brand does a nice job all around in terms of the features and quality as mentioned above. It's a great way to organize things and save space, and the mesh panels are really helpful, to see what's in each bag.