I'm with Mick on this one. The first time I was in one of the postcard exchanges(I think it was #5) I sent all my postcards in an envelope but it's fun to see in what kind of shape you receive your postcards. I've had postcards from all over the world and 90% of them come with nary a scratch but occasionally you get a little more damage. Plus you get the satisfaction of knowing that different people from all over the world (not just your recipients) get to se your image and read your words...