In which Dave showcases tear-proof Tyvek envelopes before he drives to the mailing houses.
Makes me wonder, given the cardboard insert, are the Tyvek envelopes really necessary? Of course, this is the belts and braces method, but maybe there was some saving to be done there. On ther other hand, I don't know the ratio of the cost of the envelopes and the cardboard insert (one-off process, potentially expensive for that reason.)