A very useful and practical product that’s well designed.
Before unzipping the expansion zip the cube is too shallow to easily place items in without them falling out unless they’re flat and hard as in rolled up socks vs a notebook. Once the cube is full with clothing and zipped, it can quite easily be compressed further to save space by zipping closed the expansion zip. Obvious caveat of course is that it’s not overstuffed.
Together with the large cube, it proved very useful used in the Errant Duffel.