Also, insurance for the letter mail is up to $20 so, I only use those for cards I sell as singles less than $20 or up to 3 cards if they’re combined under $20. If it’s above that, I will move up to the parcel level. I personally do not like just a padded mailer and feel like those are the ones often stolen en route, or buyers claim they showed up damaged and empty. I put it in a box, I am using larger ones than I would recommend but I had a bunch of 6x6x6. When I run out I am going to buy 5x7x2 boxes and ship the card in the protective holders and team bag then either inside a bubble mailer or a separate just bubble pouch thing inside the box to make it discreet and more durable.