Deck box size guide: how many sleeved cards actually fit?

Why a '100-card' deck box won't close on your double-sleeved Commander deck, and how to work out the size you really need.

The number on a deck box is a promise made under ideal conditions. Usually that means cards in one thin, standard sleeve. Change the sleeves and the number changes with them.

The three numbers that matter

A deck box has one physical limit: the thickness of the stack it can hold. Everything else follows from how thick each card is.

How the card is stored	Room it takes (vs. single-sleeved)
No sleeve	about 0.55
Single standard sleeve	1.0
Double-sleeved (inner + outer)	about 1.33

So a box rated for 100 single-sleeved cards holds roughly:

180 unsleeved cards
100 single-sleeved cards
75 double-sleeved cards

Worked example: a Commander deck

A Commander deck is 100 cards. Most players double-sleeve it, and most carry about 10 tokens too.

(100 + 10) × 1.33 ≈ 147 single-sleeved spaces

Add about 5% air so the deck slides out without pinching, and you need roughly 150 spaces. A box sold as “100+” single-sleeved will not close. Look for a box rated for 100 double-sleeved cards plus tokens.

Each box in the DeckDwell Commander 6-pack is sized for exactly this: a 100-card double-sleeved deck with room for tokens.

Worked example: a 60-card deck with sideboard

Magic Standard, Pioneer and Modern decks are 60 cards with a 15-card sideboard. Single-sleeved:

75 × 1.0 × 1.05 ≈ 79 spaces

An 80-card box is a snug fit. A 100-card box leaves room for tokens and a few spare cards.

Why “a bit bigger” isn’t always better

It is tempting to buy the biggest box. But a deck that rattles around in transit rubs its sleeve edges on every bump, and those edges are what split first. Aim for a box that is 85–95% full. Keep dice in a separate box or pouch rather than loose next to the cards, because dice scratch sleeves.

Card size matters less than you think

Magic, Pokémon, Lorcana and One Piece all use standard cards (63 × 88 mm). Yu-Gi-Oh! uses smaller cards (59 × 86 mm). Smaller cards fit any standard box. They just have a little side room, which a snug stack height mostly cancels out.

The quick way

Don’t want to do the maths? The Storage Finder takes your game, sleeves, tokens and number of decks and tells you how many boxes you need.