Update: Sold out.
Grid-It organizers use a criss-crossing arrangement of elastic straps to secure your sundry power cables and gadgets in your bag, and you can pick up a large one for just $7 today, an all-time low. I’ve owned one of these for years, and never leave town without it.
Unfortunately, the above listing is an Add-On item, so if you don’t have anything else you want to buy, here’s a third party alternative for $10, with Prime shipping.