Harbor Freight, have several for bolts, nuts , screws, bulbs , fuses, breakers, splices, lugs, connectors etc. They stack nicely.
I have several HFT assortment-boxed separators at home; none on boat.
On boat, although have no photo and cannot recall where I purchased it years ago: I keep a thick two sided assortment carry case that has deep, various width/length compartments. It is filled with
much nut, screw, bolt and other relatively small fastener assortments. Fairly heavy due to amount of contents. Although pretty good latches on each side I make sure to keep very good bungee cords tightly wrapped around it in alternating directions. Would not want it to fall and bust open... OMG, what a pick-it-up mess that would create!
For other items such as plumbing, electrical, calking, tapes and such I have assorted sizes of rugged clear plastic sacks with zippers and/or snaps. Now, thinking more on this I believe I picked up our boat's item storage containers at "The Container Store", a chain of outlets.
I also keep considerable assortment of tools aboard... probably too many!
I stash most of these items in forward cabin underneath V-bunk in three big doored cabinets, one to center front and one each side. Also stash extra line of all sizes there as well as other things such as complete AC/DA electric panel in forward closet. Oh crap, am I becoming a marine "old salt" pack rat??? - LOL :lol:
If I let the stern 77 gallons of freshwater tanks get too low. Waterline begins to get thinner in bow, wider in rear. Guess, some day, I'll clear out at least some "things" I keep aboard and simply leave em in our sizable dock box... however... I must clean that out first!
Happy On-Board Item-Storage Daze! - Art