I got a long sheet of thin ply, about 6" x 24", drilled appropriate sized holes, and put bolts of UNF, UNC and metric through the holes and named them, so I can identify any bolt I find.
Saves a lot of time when matching bolts.
I keep old sweetcorn tins and fill them with nuts bolts and washers of the same type.
I have a huge collection, old, new, plain, Nylok.
It makes assembly much easier, always the correct nut, bolt, or washer available in large numbers.