After completing a model, there are always some parts left (not used, or extras), and we keep them for use on other models.
At this time, I have all in a big box but messy to find something... I am curious to know how you organize those?
In a whole range of boxes and some sets of those little chests-of-drawers intended for storing screws, bolts, nuts, nails, etc. I sort things by subject, so I have a spares box with M113 parts, one with M26/M46/M47M48/M60-series parts, one with 1:72 scale vehicle parts, one with aircraft parts (I don]t build many aircraft ), one with Second World War German parts, one with Sherman suspension parts, one with all other Sherman parts, two with wheels and tracks for everything but the above, one with miscellaneous parts, and more …