Bought for a overseas trip, kept everything organized, was very helpful. So we bought more in all sizes. Makes packing a breeze. They do not compress, so don't expect that. We do use compression bags and the put that inside these and that allowed us to fit more things.However they do help keep everything from becoming a mess in your bag, and when you unpack you just put the cube in the drawer or keep it in your suitcase. We used them in backpacks (medium sized, NOT lhe large) too,and made it easy to put things in/pull out.They do fit a lot more than what you think , a carry on will fit the 2 large cubes, or 2 mediums and one large in the bottom.Good construction, easy to wash (Low heat), and when not traveling we use them to keep out of season clothing organized.