In this instructable I will show you a few easy methods to make it even more costly for companies who do mass junk mailings. If everyone were to use these methods, junk mailing would very likely stop all-together.
Step 1: Find your target
For my example, I'm going to be using an envelope provided by a college I will not be attending :P.
You want to look for "Buisiness Reply Mail" envelopes, which are provided by many companies who want information back from you. These make perfect targets because the amount of money charged to the company depends on 2 main things, Weight and routing code.