Great info & ideas. I like the Durham stuff, for sure.
I still haven't found my ideal parts solution, but am ok with a plethora of different storage boxes/bins for now (helps for first pass locating!).
BUT. I found I could no longer comfortably lift my main 'holds nearly everything' tool box, and wanted something smaller and lighter to hold the 'fixes 90% of stuff I work on'.
Since I have a number of Festools, I dabbled with their parts systems, but are too pricey (the OPs Stanleys are probably better for that), and not always 'inversion friendly' for little stuff. (Great for bigger tools though.)
Then, a light bulb: For a few years I'd laughed at the little Festool Mini-Systainers, but it dawned on me that they might work really well for carrying a decent assortment of stuff around the place to the project at hand.
Plus, they latch and stack together really easily.
So, I got one, then another, and then
another. I'm smitten now. Sometimes can be found for less used (and the grey one helps for easy identification)...about $30 ea, IRCC. The weird thing is that I've considered getting a 4th one, but don't know what I'd put in it! (Maybe 'parts needed'?)
I have one for small hand tools (ratchet drivers, multi-screw drivers, pliers, etc etc), one for the Fluke meter, and one for a small bendy Makita (white) power driver (with room left over for a very small drill, too).
(Got one of these
https://www.amazon.com/gp/product/B00A50NB2Y/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1
for manual driving, too - fits perfectly with various bits & extensions)
Now I 'pick & stack' the ones I need at the moment; lightweight, holds a LOT of stuff, and gets me through almost all repairs or small 'build' projects...and still haven't filled them with tools yet.
Very happy with 'em - and STILL surprised they work so dang well.