I keep a paint stick with my files and scrench. Mark my gas cans with mix percentage. Also lets me put a quick paint mark or intials on new equipment (saws, scarbards, cooler, etc) I've gotten. Keeps someone from mistakingly putting my things in the wrong vehicle.
I paint all my stuff with a lot of hi-viz paint. I found a customers (unmarked) rake in our truck yesterday (employee).
I spray it into crevices, so its hard for a potential thief to fully clean, as well as the usual visible spots.
$2.50 flagging tape, cheap electrical tape, cheap duct tape, and cheap spray paint are all readily available. Sometimes I have to put straight gas in a mix can----lots of flagging or rope or duct tape on the handle making it impossible to not see/ feel the warning device.
Mix gas (marked) goes on one side of my pick-up bed, straight gas on the other.
Business Name and phone numbers help on bins, rope bags, etc.
Paint pens are good for writing service dates/ filter numbers 'under the hood' , date/ mileage of change of part and store from which its purchased. Suppose you have a starter motor go out from a store where you have a "rewards account". If you can see Napa written on the side, you might remember that it has a lifetime warranty, or you could write Napa LTW. 2/24/16,