Our go backpacks each have a printed-out list of the contents in the top pocket. (The items are listed in groups according to which pocket they are stored in.) This helps when I need to change out something and don't have to dump out everything to find it. (Like, where did I stash the spare batteries?)

Whenever I tinker with the contents, I update the lists on my computer and print out new copies. Having the list on the computer helps me when I get a new suggestion from, for example, this forum. ("Bring a toothbrush? What an excellent idea! Oh, wait, I already did that.")

As for the endless series of flashlights, Leatherman tools, and pocket knives, all acquired in the lifetime search for an Even Better One, they just go in a plastic bin.