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Sleeves and storage: how to protect cards you open and boxes you keep sealed
Most card damage does not happen in a tournament. It happens on a kitchen table, in a backpack, or over eighteen months in a box next to a radiator. Protection is cheap and boring, which is exactly why people skip it.
Sleeve sizing, once and properly
Pokémon, Magic, Riftbound, Yu-Gi-Oh! in oversleeve use and nearly every other modern TCG use the same standard card size: up to 63 × 88 mm. A pack labelled “standard size” fits all of them. Japanese-size sleeves (roughly 59 × 86 mm) exist for Yu-Gi-Oh! and Japanese-format games and are the inner sleeve in most double-sleeving setups.
If a sleeve is too large, the card shifts and the corners take the impact. If it is too small, you will bend a card forcing it in. Both are worse than no sleeve at all.
Matte or glossy
Matte, for almost everyone. Glossy sleeves stick together in a freshly sleeved deck and then slide apart unpredictably once they have been handled; matte shuffles consistently from day one and does not throw glare under tournament lighting. The textured back is also less prone to showing scuffs that make a deck look marked.
The one thing to check before a sanctioned event is opacity: no light should pass through the back of the sleeve. Thin sleeves with a light-coloured back can fail this, and a deck that fails opacity is a deck you cannot play.
How many sleeves you need
- One 60-card deck: one 100-pack. The spares matter — a scuffed sleeve mid-tournament has to be replaced, and replacing one sleeve from a different pack can make it distinguishable.
- Double-sleeved deck: two packs. A Japanese-size perfect-fit inner, a standard matte outer.
- Storing hits from a booster display: one pack comfortably covers the keepers from a box.
Double-sleeving, and when it is worth it
Inner sleeve goes on upside down relative to the outer, so the open edges do not line up and the card is effectively sealed. It costs a little deck thickness and a lot of peace of mind. Worth it for a deck with expensive singles or for anything you intend to grade later; unnecessary for a casual deck of commons.
Storing sealed product
Sealed boxes fail in three ways: crushed corners, sun-faded artwork, and shrink wrap that goes cloudy or tight in heat. All three are storage problems, not luck.
- Store flat, not standing on an edge, and do not stack more than a few high.
- Keep out of direct sunlight. UV fades printed cardboard faster than most people expect.
- Stable room temperature. Lofts, garages and the top of a radiator cupboard are where sealed product goes to die.
- Avoid humidity swings — they warp cardboard and can spot the wrap.
If you intend to resell later, resist the urge to add extra wrap or a sticker. Collectors want the factory wrap untouched, and anything added to the outside makes a box harder to verify, not easier.
Frequently asked
Do sleeves affect grading?
Sleeves do not get graded, but the condition they preserve does. A card that lived in a matte sleeve from the moment it left the pack has a materially better chance at a high grade.
Can I mix sleeve colours across decks?
Yes, as long as each individual deck is uniform. Sleeves from the same product line share back texture and opacity, so the decks are indistinguishable from behind.
Are cheap sleeves fine?
For storage, often yes. For shuffling, the difference in feel and durability shows within a week.
All sleeves we stock are standard size, 100 per pack: Card Sleeves. If you are choosing what to open in the first place, start with our guide to sealed Pokémon formats.
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