I have two of these Cubelets mounted to the loops inside my Paramour backpack and they are the absolute perfect things to keep my ADHD brain from losing stuff. Each of my Cubelets has a key strap keeping it captive to my backpack, but long enough to take them out and open them up outside of the backpack. As a person who would lose his own head if it wasn't bolted on, this is the perfect workflow for me.
Just one Cubelet contains my headphone case, pill case, pocket knife, nail clippers, memory sticks, lens cleaning cloths, travel Bandaid box, and other small things that would otherwise be loose at the bottom of my bag or need to be lumped together in a zipper pocket. But with the Cubelet and key strap solution, I can access small things much easier without needing to plumb the depths of my backpack.