I used these for the first time when packing for a nearly-3-week long trip.  They were awesome!  I left packing to the last minute (oops!), but was able to quickly and efficiently pack everything I needed.  Everything was organized and actually fit into my one suitcase, leaving me to only carry the essentials I had to keep with me in my carry on.  Once I arrived at my destination, I was able to quickly and easily unpack, since my suitcase was so organized.  Packing to go home was also fast and easy, and I was again able to get everything into my one suitcase -- so much so that I actually ended up over the weight limit with that bag.  Usually remedying that would mean rummaging through my bag, shifting items, shoving those into an (over-full) carry-on.  But, in this case, I simply moved one cube from the suitcase into my (nearly-empty) carry-on & zipped both bags both up.  I can confidently say I'll never pack without using travel cubes again!