These compression packing cubes are my favorite. They are slippery, which makes for easy packing. I have used them in my carry-on backpack and a small rolling suitcase on different trips. I loved them. They keep my clothing in the best condition of all the methods I have used. I can even carry a change of clothing or a down parka in my handbag with these. The bigger on fits sideways in all of my different backpacks. I have two sets because they are super lightweight and compress so small that I can separate my clothing categories for greater ease at my destination.