For years, I didn't understand the benefits of packing cubes. Eventually, I started reading a lot of articles about one-bag packing and decided to give them a try. First game-changer. I found that I really liked the organization of packing cubes. Then I discovered compression packing cubes. Second game-changer - organized, plus keeping things tight so less chance for wrinkles, and saving a little space. These Thule compression cubes are the best I have come across - the zippers are so sturdy! And they are just the right size for my Cotopaxi Allpa. Now I can't imagine traveling without them.