Your card(s) will be shipped in a white business envelope(s) via USPS regular mail.  

I safely and securely ship lots of cards in plain white envelopes via regular mail without any issues.  

Your cards will be placed in sleeves, then inserted into top loaders and finally placing them into team bag(s).  I then use painters tape on both sides of the team bag to attach them to the packing slip to prevent them from shifting in the mail.  

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