Just used these (in 2 sizes) for a 3 week business trip to Europe and Asia. Went to 4 countries in that time and had the least issue with packing and repacking ever. Hotel laundered shirts are folded to exactly fit the medium packing cubes. I have subsequently used these for a trip to snow country (WA and ID) and packed my down jacket into the medium cube. My parka fit nicely into the large. While this is a bit different from using a stuff sack it works great for putting into a carry on suitcase as opposed to a backpack. I won't leave home without these.