Storing tools, spare and useful stuff

[bobirving]

How the heck do you do it?
We have 3 - 4 sorts of stuff for running our Café: tools, either loose individual tools, sets in cases, loose sets; spares, like light bulbs of all sizes, cable, plugs; consumables, like adhesives, screws, bolts and washers. Everything is a different size and shape and needed randomly or not at all(!). We have to get it all out at the start of the session and put it away at the end, neatly, because we only have limited storage space. There are so many different things that it's difficult to remember whether we have a particular thing... 
What do other people do to store stuff?