i use a combination of socket holding devices in my service truck.
metal trays that most of my sockets originally came in
MTS magnetic holders
SO metal rails
lisle flat holder
the lisle is probably my least favorite, but it lays flat in a repurposed blow molded box with a smaller CM blow molded box. i keep all my 1/4" dr tools in it.
i've found individual empty socket trays at the flea mkt in the past, as well as plastic CM blow molded boxes. socket trays usually a $1 or 2, blow molded boxes up to $5 or so
my trick was to cram as much stuff into the top of the box so nothing can move
not much of a close up pic, but the only one i have
this is only 3/8" & 1/2" dr sockets
