PSA's own kit bundles most of this into one box: a mailer, 20 penny sleeves, 20 semi-rigid holders, a microfiber cloth, and 4 Ultra Pro card protectors. Buying the pieces separately usually costs less if you're submitting more than a handful of cards.
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Penny sleeve
The first layer, directly on the card. Any brand, this is the sleeve you're taking off before the card goes in front of a grader anyway.
Step1
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Semi-rigid holder
Card Saver 1 or equivalent. Taped shut with painter's tape, never regular tape, on the holder itself, not touching the card.
Step2
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Submission form
Downloaded and filled out from PSA's site before anything ships, not something to figure out at the post office.
Step3
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Sturdy box, bubble wrap, tracking
A corrugated box, not a padded envelope, packed so the cards can't shift, shipped with tracking and insurance for what it's actually worth.
Step4