A card in perfect condition can be worth several times what the same card fetches with a dinged corner. Here's how to keep it that way, step by step, from the simplest layer to the most complete.
What actually damages a card
There are three causes, and each one needs a different solution.
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Handling. Shuffling, playing, flipping through pages. It wears down corners, edges and the surface.
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Humidity and heat. They warp cards, and foils go first.
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Light. UV rays fade the inks over time.
Your card size
Almost every modern TCG uses the same size: 63 x 88 mm. That covers Magic, Pokémon, Lorcana, One Piece, Star Wars: Unlimited and Flesh and Blood. So a "standard size" sleeve works for all of them.
One exception to watch for: some games, like Yu-Gi-Oh!, use smaller cards that need Japanese-size sleeves.
Layer 1: the sleeve
This is the foundation, and it solves 90% of the problem.
Soft sleeves (also called penny sleeves) are thin, clear and very cheap. They're meant for storage and shipping, not for play.
Deck sleeves measure 66 x 91 mm and are much thicker. They're built to be shuffled hundreds of times. An opaque back is mandatory for tournament play, since nobody should be able to tell one card from another by looking at the back.
What to check on the packaging: PVC-free and acid-free. Polypropylene is the material recommended for long-term storage. PVC can break down over the years and damage the very card it's supposed to protect.
Double sleeving
If you want maximum protection for a deck you play often, you can use two sleeves.
The inner sleeve measures 64 x 89 mm and hugs the card tightly. Many players insert it upside down, from the top, so the opening ends up closed. The whole thing then slides into a standard 66 x 91 mm deck sleeve.
The result: the card is protected on all four sides, spills included.
Layer 2: rigid protection
For a valuable card that won't be played, a sleeve isn't enough. You need something that stops the card from bending.
Toploaders are rigid plastic shells, open at the top. Important rule: the card goes into a soft sleeve before it goes into the toploader. Without that, it shifts around inside and the edges rub against the plastic.
Thickness is measured in points (pt), and that number describes the toploader's capacity, not the card. A standard card is roughly 20 pt thick, so a 35 pt toploader is the right call for a card in a soft sleeve. Thicker sizes, from 55 pt up to 360 pt, exist for cards that are genuinely thicker.
Careful, though: too thick is as much a mistake as too thin. In a 100 pt holder, a standard card floats around and the edges take damage. And one card per toploader, never two.
Magnetic holders (usually called one-touch) open and close without any forcing, which makes the card easier to remove and much better looking on display. Pick a model with UV protection if the card will sit in a lit room. Check the thickness too: magnetic holders use the same point scale as toploaders, from 35 pt up to 360 pt, and it has to match your card, sleeved or not.
The special case of grading
If you plan on sending a card in for grading, don't ship it in a toploader. PSA requires a clear soft sleeve followed by a semi-rigid holder such as a Card Saver I. Toploaders and magnetic cases are not accepted for normal-thickness cards, because a semi-rigid flexes slightly and lets the grader slide the card out without risking the corners.
Other companies are more flexible on this, but all of them recommend semi-rigids. One last detail: skip matte or colored sleeves, since the grader has to see the whole card.
Cards that are already graded
A grading slab is not scratch-proof. The acrylic picks up marks from handling, shipping and storage, and a scratched case lowers resale value even though the grade printed on it hasn't changed.
Resealable sleeves made for slabs solve this for a few cents each. They matter most if you sell or trade graded cards.
Shipping a card
The order to follow:
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1. Card into a soft sleeve.
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2. Sleeved card into a toploader.
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3. Toploader into a sealed team bag.
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4. Team bag between two pieces of rigid cardboard, inside a rigid or bubble mailer.
The detail almost everyone gets wrong: the tape goes on the team bag, never directly on the toploader. Tape stuck to the plastic forces whoever receives it to pull hard on the card to get it out.
Binders
This is the best format for a collection you want to look at rather than store away.
Three things to check:
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Side-loading pockets. Cards can't fall out when you flip the binder over.
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PVC-free pages. Same rule as sleeves.
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A zipper closure. It protects the binder's edges and keeps out dust and moisture.
Two habits once you own the binder. Never overfill a pocket: forcing a second card in stretches the plastic, and the pocket stops holding anything properly after that. And store your binders standing upright on a shelf, like books. Stacked flat, the cards in the middle absorb all the weight.
Storage boxes
For volume, nothing beats a good cardboard box. Look for acid-free on the label, and store cards standing upright like books rather than lying flat in stacks. A stack crushes whatever's on the bottom.
For carrying a deck around, a rigid deck box is far better than a rubber band.
Where you keep all of it
This is the step everyone skips, and it's probably the most important one. The best sleeves in the world won't save a collection stored in a garage.
The targets to aim for:
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Temperature between 18 and 22 °C (65 to 72 °F). Stability matters more than the exact number. A room that swings a lot between day and night is worse than a room that's consistently a bit warm.
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Humidity between 40 and 55%. Too humid and cards warp while foils curl. Too dry and the cardboard turns brittle.
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No direct light. Keep them away from windows.
Avoid the attic, which bakes in summer, the basement, which is damp, the garage, where temperature swings hard, and the car, especially in summer. An interior closet does the job nicely.
If you live somewhere humid, a hygrometer costs about ten dollars and tells you exactly where you stand. Silica gel packets in your boxes handle most situations.
The most common mistakes
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Putting a rubber band around a stack of cards. It leaves a permanent mark.
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Storing a valuable card in a toploader without a soft sleeve.
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Leaving a card in direct sunlight, even behind glass.
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Handling cards with dirty or damp hands. Pick them up by the edges.
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Stacking heavy boxes on top of cards stored flat.
In short
A sleeve for anything you play. A soft sleeve plus a toploader for anything valuable. A magnetic holder for anything you want to display. An interior room, moderate and dark, for all of it.
Find all the accessories you need here:
https://themythicstore.com/collections/supplies-accessories
