Mail bag for Kate and Mark's mail

Our neighbours regularly go overseas on work and they always ask us to collect mail for them. We generally get an old paper bag, write Kate and Mark's mail on it and then I just give them the bag when they return.
At the moment they are honeymooning in South Africa ... I got a bit sick to death of the "old paper bag" hanging up behind our door and so I knocked this up from some japanese fabric I had. It is a little bit dodgy ... using the same pattern that I drafted for the little kids back pack.