My suitcase has a "compartment" for my suits so that is not an issue, but if they are effective, it could really free up some space in my suitcase. This is key because if history repeats itself, my girlfriend will take over my suitcase as well.
Since I found them, I never travel without them. I use the type that you roll so no vacum is needed. I have never went over on luggage weight which I was concerned about the first time I packed with them.
I can now use my two medium size cases instead of 2 large ones when packing for hubby and I. We purchased ours at Wal Mart and they were not expensive either. Well worth the money.