Double-Sleeving
The two-layer method that seals a card on all four edges, and how to do it without trapping dust.
A single sleeve leaves one open edge. Double-sleeving closes it: a perfect-fit inner goes on upside down, then the outer sleeve goes on the right way up, so the two openings sit at opposite ends and the card is sealed on every side.
The order is not interchangeable. Inner first, inverted, every time — reversing it leaves a funnel straight to the card face, which defeats the entire exercise.
Seat the inner sleeve on a flat surface and push air out from the closed end before the outer goes on. Trapped air makes a deck sit unevenly and, worse, holds any dust that came in with it against the card surface.
Expect a deck to grow by roughly 30% in thickness. Check your deck box before you sleeve a full playset — this is the moment most collectors discover their box was sized for single sleeves.
