I was cleaning up the shop the other day and decided to thin the herd of oil drain pans that we've accumulated (as in, the boss said, "Clean up that mess.)
I set aside and saved half a dozen 5-gallon buckets, because those are oil-change necessities. I placed in a special place a triangular, 1-foot by 1-foot by 1-foot by 6-inch-deep drain pan that's proved to be perfect for sticking one of its corners under filters in tight spots to catch draining oil or fuel. I also saved a special plastic drain pan, curved to fit inside a semi-truck's wheel rim, under the axle hub, so you can drain the hub without spilling oil all over the rim.
The boss specifically told me to toss a bunch of 1-gallon oil jugs that have been carved into odd shapes, but I rescued them because I knew that the jug that's cut sideways so its 6-inches by 9-inches by 1-inch deep fits perfectly under filters on a specific model of combine. I also rescued tall skinny drain jugs, and jugs with odd holes cut in their side.
Ultimately, I threw away two leaky customized jugs, and immediately carved duplicates to keep on hand. So I still have the same number of drain buckets and customized drain pans as before, but organized them or hid them so it's not so "messy."
One man's mess is truly another man's tools of necessity.