Over a period of time, I've saved the meal containers which are clear, also non transparent ice cream containers in the past to store bolts,nuts, screws and anything else that needs storing. Labels torn of the box and inside the container in case I change the contents (for the clear ones)
I've just built a workshop so once I start to move stuff into it, time will tell if they are useful,but had adjustable shelving previously so should be ok.