Please Mr Postman
One of the hardest things about doing great direct mail is the cost of postage.
As long as you stick to a standard envelope size it's not a problem.
But go a millimetre or two over and postage costs increase dramitically.
It appears the people at Sunglass Hut learnt this the hard way when they sent the invite above to Mumbrella.
Excess postage and lots of it.
Hardly the best way to get people to your event.
Especially people from a marketing industry website.