While I generally love Eagle Creek products, I never understood the packing cubes because they added unnecessary weight. These bags have no weight at all. I recently used them on a two week road trip and had no problem finding anything in the chaos of my car when I stopped for the night. I was able to fit two weeks of underwear in one of them and compress five days worth of shirts in another.

Sure using plastic grocery bags also work, but the translucency of these make it easy to see what's inside, the compact shape holds everything in place and their softness doesn't seem to take up all the extra space the grocery bags do. The handles also make them a good replacement for bulky toiletries bags. These bags make it possible to travel for a week with a 20" suitcase - not an insignificant accomplishment.