I use magnetic dishes/pans and once I move to another section of car with different bolts, I put them all in a ziplock bag. I put masking tape on the ziplock, and write in Sharpie what the bolts/nuts etc are for. Then I fill up the trays again. Makes it very easy to put things back together, even days later! For larger pieces that don't fit in ZipLock's I use oil containers I've cut the top off and washed out with degreaser/cleaner, then put a ziplock bag over the top with a label for what's in it. Takes up very little space, keeps out water/humidity, easily labeled, and works well for me!