Along with the black garbage bags I wrote about previously, I packed Ziploc bags that were useful for a number of things. I have found two sizes worked well, the sandwich and gallon sized bags.
The sandwich bags are good to keep coins, littlesouvenirs, snacks, food leftovers, and cords packed nicely. While packing, I wrapped cords up and put them in separate bags with their power adapters. When you’re in a hurry while travelling, just pull out the desired bag and leave everything else undisturbed. No tangled mess of cords to untangle.
I keep a bag of quarters and pennies with me for the times when I come across a penny smashing machine. No loose change bouncing around the bottom of my backpack. A small bag keeps them together.