I find this idea, an elastic-covered board for in-bag gadget organisation, quite intriguing, though I don't have a lot of items in my bag that would benefit from this kind of organisation tool. And the price isn't bad, either. Still, it seems like exactly the kind of thing an enterprising Maker could put together with a little elastic, velcro, felt, foam and wood. Plus, the end result would be reconfigurable, which is a bonus. My guess, however, is that materials costs would outweigh the commercial version and then labour on top would make the DIY version a financial net loss. Still, an intriguing project.
Mokalus of Borg
PS - The product is called "Grid It".
PPS - The commercial versions are only about $15.