That would be why it's a DOUBLE cube :). It really is about twice the size of the regular cube.  I have two . . .one I've used for a couple years now, in a very large suitcase for long trips.  I most often use it for things I've purchased along the way, to keep it separate from my clothes etc.  When I'm not traveling, one is used to store all my empty cubes and the other to keep emergency supplies in my car (first aid, solar blanket, flashlight, etc.)