I use brown A2 envelopes with Ebay Standard Envelope shipping for all card orders under 20.00 USD or under 20 cards. Cards will be in single penny sleeves, in a plastic bag, sandwiched between cardboard. If your order exceeds 20.00 USD, more than 20 cards, or you’d like it shipped in a bubble mailer with thicker cardboard please choose the USPS Ground Advantage option at checkout. I do not carry top loaders or the plastic card shipping sleeves.