All depends on which series they’re from.
Probably do something to make to a bit more rigid like stick a piece of cardboard in the envelope or put the pack wrapper in a semi-rigid sleeve (cardsaver/ultrapro)
I recommend using Canada Post untracked lettermail which obviously comes with the risk of shipping untracked (but honestly not much of a loss if something were to actually go wrong) rather than shipping it as a parcel. It’s like the difference between $2 and $14
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Okay thanks for the replies I’ll try the cardboard or semi rigid sleeves. I’m going to try to sell about sets of four. They’re mostly from ex series and a little bit from wotc era/D&P/Platinum.
You can put them in a team bag with something rigid like a card saver or piece of cardboard. Even with something to reinforce it you shouldn’t need more than one stamp.
30 g or less is a single stamp.
www.canadapost.ca/cpotools/apps/far/business/farLetter?execution=e2s1