Reusing Envelopes

I have officially run out of envelopes from a box that my parents bought me in college. It was a sad, sad day since I no longer have fresh blank envelopes. : (  You may ask "how did that box last her so long?" (Especially since many of you know how long ago I entered college.) Well, it's because of how often I reuse/repurpose envelopes.

Any envelopes I receive to send back payments and such, I keep. You can just put a white label over an unwanted address or white it out. There's no law against reusing an envelope you just have to make sure it's clear where you want it sent and put the proper postage on it. The only thing that I have come against is that you have to make sure to black out any barcodes. Otherwise the automated USPS system will send your letter somewhere you don't want it to go!