A single Arkham Horror investigator deck looks simple to store until you actually account for everything that travels with it - the main deck, signature cards, weaknesses, and sometimes a smaller mini-format card too. Getting the box size wrong is a common first-time mistake.
Unlike a Commander or Standard deck in another card game, an investigator deck isn't a fixed 60 or 100 cards. Deck size varies by investigator and by how deep into a campaign you've built it, which affects how much room you actually need.
This guide walks through what actually needs to fit in your investigator's box, how to size correctly for growth across a campaign, and what to do about the smaller mini-card format some investigators use.
Getting this right from the start saves you from a frustrating mid-campaign box swap once your deck outgrows its container.
A built investigator deck typically runs somewhere in the 30-to-45 card range depending on deckbuilding choices, plus the investigator's signature cards and any weakness cards drawn into the deck. That's meaningfully smaller than a 100-card Commander deck, but it still needs sleeved-card-appropriate room.
Beyond the deck itself, many players also store a copy of the investigator's card and any relevant campaign reference cards in the same box, which adds a small amount of extra bulk worth accounting for.
Since standard Arkham Horror LCG cards sleeve at the same 2.5-by-3.5-inch size as Magic or Pokemon cards, a deck box sized for roughly 100 sleeved standard cards comfortably fits even a maxed-out investigator deck with room to spare. Oversizing slightly is better than cutting it close.
If you're double-sleeving any particularly valuable or heavily-handled cards, budget for extra thickness in your box size calculation, since double-sleeved cards take up noticeably more room than single-sleeved ones.
Some investigator cards and certain accessory cards use a smaller mini format, roughly 1.625 by 2.4 inches, which won't fit a standard deck box slot designed for full-size sleeved cards. These need a separate, dedicated mini card holder rather than being crammed into the same box.
Checking your specific investigator's card format before buying storage prevents the frustrating discovery that a key card simply doesn't fit alongside the rest of the deck.
Investigator decks evolve throughout a campaign as you add experience-purchased cards and swap out weaker early picks, meaning your deck size at the start of a campaign isn't necessarily its size by the end. Buying a box with some headroom avoids a mid-campaign upgrade.
Players running multiple investigators across different campaigns benefit from a consistent box size across all of them, since it simplifies storage and makes swapping between active decks faster.
A dedicated single-deck box per investigator keeps signature cards and weaknesses from getting mixed up with a different character's deck, which matters more in Arkham Horror than in games with less deck-to-deck card overlap. Investigator-specific cards are often unique enough that mixing them up creates real confusion.
If you're running a full party of investigators for a multiplayer campaign, individually labeled boxes per investigator make session setup noticeably faster than sorting one combined box each time.
A rigid plastic deck box offers better card protection during transport to game night, which matters for a long-running campaign deck you're carrying to the table repeatedly over weeks or months. Fabric boxes are lighter but offer less structural protection against drops or pressure.
For a deck you expect to use across an entire campaign's run, the added durability of a rigid box is usually worth the modest size and weight tradeoff.
Each new campaign expansion typically introduces additional investigators, meaning your storage needs will keep growing as long as you keep collecting new content. Buying deck boxes in a consistent size and style from the start makes it easier to simply add another box to your shelf rather than reorganizing your whole system each time.
Standardizing on one box size across your entire investigator roster, even if a particular deck is currently smaller than the box's capacity, pays off once that same investigator's deck grows through experience purchases later in a campaign. Consistency now saves a disruptive swap later.
Roughly 30 to 45 cards, plus signature and weakness cards, depending on deckbuilding choices.
No, they need a separate, smaller dedicated card holder.
Plan for growth, since experience purchases will add cards across a campaign.
Plastic offers better protection for a deck you're carrying to the table repeatedly.
Get your investigator's deck properly sized and protected with storage from EVORETRO's Magic the Gathering Collection.
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