We've test driven a few options to organize all our "stuff" and I finally started taking pics so I can post them here. Keep in mind each little organizer takes up space and add weight on its own. Even with that in consideration, I can't stand having to move all the little bits and dig through a well mixed pile of stuff to find the one cable or device I need.
The first item up are really cool little zipper bags that I found at Walmart for $2.99 each (sometimes in the office supplies, sometimes on hangstrips in random departments - crafts, do it yourself, groceries, depends on the store). I am up to probably 10 or more of these now and love them. They measure 12" wide by 7 1/4 high. If you ever had a cloth zipper pencil pouch, this is that same pouch on steroids. Some items we store in them: RECEIPTS waiting to be entered in the computer; CAMERA bits such as extra memory card, battery charger, download cable, manual; BINOCULAR straps, cleaning cloth, etc.; GEOCACHING- GPS, pencil, notebook, ready to toss in day pack and go; LED EMERGENCY flashers; TIRE repair kit; rolls of different kinds of TAPE (little buggers liked to wander and pick up crud); RADIOS - walkie-talkies with rechargeable batteries and cables; GRANDDAUGHTER'S brush, hairbands, toothpaste, toothbrush; CAT'S brush, nail clippers, meds; etc. We tried ziplock baggies but they just weren't doing it. Now we use the sharpie to label the pouch, load her up and stuff her in the cabinet or bin. The upper cabinet with shelf behind the drivers seat has several lined up, standing on end (with a bit folded down on each). Some are in John's tool bin. All are easily grabbed when needed.