The second of the three R's is reuse, which UPS has been making it easier to do. They just developed an envelope which can easily be used twice, with no marking out addresses or tapping envelope ends necessary.

It is a great how they made the reusable design so easy to use. However, I'm going to have to give them some grief on the new design implementation. They are still offering old, non-reusable envelopes on their site for the same price. Why still have the old, more wasteful versions?

Found via Cool Hunting.