This grid of rubberized woven elastic straps stores cables, batteries, pens, card decks, earbud sets, flashlights, and other small items. Things will not slip out because the straps are rubbery. It's 9.5 inches by 7.5 inches and will fit in a laptop case or carry-on bag.

Cocoon GRID-IT! Organizer Case ($7) on Amazon

http://feeds.boingboing.net/~r/boingboing/iBag/~3/GLamM09Kplk/travel-organizer-for-your-gadg.html