Great idea: reversible packaging. The sender puts the mailing label on the monochrome-printed box, then the recipient turns the box inside out to get the coloured version!
It would make it more difficult to surprise someone with a gift of PM if they see the parcel though.
Will these sets be sold with the colourful side showing, or ready-to-ship with the dull side showing?
MISB collectors can now exercise their inner stamp collector and insist on MISBGFM (MISB Geniune Franked Mail*) or even insist the package bears postage stamps, not a printed label with barcode.
*Stamp collectors (I used to be one!) do distinguish between used stamps that have been through the postal system as opposed to CTO, cancelled to order stamps which have a carefully-placed postmark but are otherwise mint.
