I do a lot of eBay sales and Sales4Less bubble post boxes are probably the best product to use today and at a great price . . They have a stronger outer layer that offers more security than the thinner mailboxes I've received in the past and they're great at showing the recipient that the corners haven't been trimmed. Never had a problem with these mailers via USPS before. They usually have the books ready for me, which I wrap and then attach to the cardboard spine, put in the mailbox and add an extra piece of tape along the seal (I don't think it's necessary otherwise). You have my highest recommendation.
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