Here's an easy and effective way to manage screws, washers, and other small parts that you need to transport or want to store with the hardware that they belong to. I find it most useful when I'm removing usable parts from broken computer hardware.
Step 1: The problem
So here I am in the office. I've removed the parts I wanted from a broken PSU, but the screws and washers are going to be hard to transport home without a container. I could use a small sandwich bag or a box, but usually I don't have those handy. So I'll use packing tape.