These Eagle Creek Pack-It Specter Cubes are so much lighter than my other packing cubes but don't sacrifice the amount you can pack in the cubes. They are great for underwear, shirts, sleepwear - just about anything. The only thing I noticed is that the zipper doesn't go all the way around the cube - probably to save weight. I thought it might be an issue but it really isn't. The fabric isn't see through but it is so lightweight that you can tell what's in the cube without unzipping it. With the increase in baggage fees on the airlines, every ounce you can reduce is helpful. The handles are also great for grabbing the right cube and they are great for keeping thing organized while you're traveling. I'm sold on these!