1. Very inexpensive for the bag count.2. Very high quality irrespective of pricing.3. In between typical polyester weaves and the ultralights in terms of fabric thickness; I’d call them a worthwhile upgrade in sturdiness compared to the fabrics that are so thin they are translucent.4. Zippers seem high quality (use your thumb or finger between zipper panel and cube wall while compression zipping to avoid snags).5. These might compress the center of an ultralight down jacket, but DON’T compress the central portion of clothing that is already pretty flattened out or thin, such as polo shirts and cargo shorts.6. WHAT THEY DO EXCEEDINGLY WELL is compress along all four edges which stops “contents sag” - regular cubes aren’t tight enough and my contents used to shift and sag to the cube bottom, defeating the used of cubes upright in my day packs.7. A selection of colors helps code contents, if the variations in sizes aren’t enough to do that.Only Possibly Significant Negative:Except for maybe “vacuum” sack packing cubes, all edge-zipper style packing cubes sill only slightly compress the contents away from the perimeter, while significantly narrowing the perimeter. This means shifting is stopped, but the cubes leave rounded off edges with some waste space on the sides of my packs. Of course we are never lucky enough to have perfectly matching sizes of cubes to packs, and most are tapered on top of that, so you’ll have to figure out what to do with the resulting dead spaces here and there.A minor complaint: the cubes don’t open as wide as I’d like, so I have feel the fit as I fold and add layers to them.“Secret” bonus benefit off packing cubes in general:If you have to rummage during a security secondary inspection, having stuff in cubes makes repacking MUCH easier, on the fly and in a hurry. I’ve never been asked to unzip a cube when, for example, they are looking for a forgotten water bottle or power cube (they just feel the cube contents by hand without an unzip, assuming they find the questionable object the x-ray scanner highlighted.