Card Protection Guide — Tokyofishmarket

Size matters — get this right first

The #1 beginner mistake is buying the wrong size protection. Japanese cards are NOT all the same size.

Standard size (63x88mm) — Pokemon JP, One Piece, Weiss Schwarz, Digimon, Cardfight Vanguard, Union Arena. Use standard sleeves and top loaders
Small/Mini size (59x86mm) — Yu-Gi-Oh! OCG ONLY. Needs specific mini sleeves and small top loaders
If you put Yu-Gi-Oh! cards in standard top loaders, they rattle around and get edge damage. If you try to fit standard cards in mini sleeves, they won't fit. Check your game before buying

Penny sleeves — the cheapest option. Fine for bulk/common cards. Not acid-free, not great for long-term. ~$1-3 per 100
Perfect-fit / inner sleeves — tight fit, designed for double-sleeving. KMC Perfect Fit is the gold standard. Get the right size (Standard or Mini)
Standard outer sleeves — for gameplay or the outer layer of a double-sleeve. KMC Hyper Mat, Dragon Shield Japanese size
Double-sleeving — perfect-fit inner + outer sleeve. The minimum for any card worth $5+. Protects against dust, moisture, and surface contact
Art sleeves — character sleeves from Bushiroad, Dragon Shield, Ultra Pro. Fun for gameplay, not recommended for grading or storage (opaque backs can hide damage)

Standard top loaders (76x102mm / 3x4 inch) — for standard-size cards (Pokemon, One Piece, etc.)
Mini/Small top loaders (60x88mm) — for Yu-Gi-Oh! OCG cards specifically
35pt thickness — standard for single cards. Thicker versions (55pt, 75pt) exist but aren't needed for regular TCG cards
UV-protected top loaders — worth the premium for displayed cards. UV fading is permanent
Card Saver 1 — semi-rigid holders required by PSA for grading submissions. Do NOT submit in top loaders
Magnetic One-Touch holders — snap-shut rigid cases with magnets. Premium display option. UV versions available. $3-8 each

Side-loading pages over top-loading — cards can't fall out when binder is upright. Non-negotiable for valuable collections
9-pocket pages — standard layout. Ultra Pro Platinum (acid-free, archival) or Dragon Shield for quality
4-pocket pages — for showcasing high-value cards with more visibility
D-ring binders over O-ring — keeps pages flat, reduces bending at the rings
Japanese-specific binder pages exist from Bushiroad and Ultimate Guard with tighter pockets for 63x88mm cards
Sleeve your cards BEFORE putting them in binder pages. Never put raw cards directly into pockets

UV light — fades prints permanently. Keep displayed cards away from windows. Use UV-protective cases for display
Humidity — ideal 40-50% relative humidity. Too dry = brittle cards. Too humid = warping, mold. Silica gel packets in storage boxes help
Temperature — 18-22°C ideal. Avoid attics, garages, cars. Temperature cycling causes warping and foil separation
Storage boxes — BCW 200/400/800 count boxes for bulk. Dividers prevent cards from shifting
For graded slabs — specific slab storage boxes sized for PSA/BGS cases