Mayday Premium Lost Cities Magnum Sleeves: Fit Guide

Measure before you sleeve

Lost Cities cards are not a standard poker or euro size, so the first step is to confirm the card dimensions rather than guessing from the game box. Mayday Premium Magnum sleeves are built for cards measuring 2.76" x 4.33" (70mm x 110mm). If your Lost Cities deck matches that footprint, this is the correct sleeve family to consider.

Lay a single card on a flat surface and measure its width and height with a ruler that shows millimeters. Compare those numbers to the 70 x 110 mm figure. A card that is noticeably narrower or shorter will slide around inside a Magnum sleeve, while a card that is wider will not fit at all. Do not force a card into a sleeve; the fit should be snug but not bending.

The size this sleeve is built for

• Mayday Premium "Lost Cities" Magnum Card Sleeves (50): Fits cards of this size: 2.76" x 4.33" (70mm x 110mm) Magnum "Lost Cities" card sleeves. This is the single most important checkpoint: if your cards match 70 x 110 mm, the sleeve is designed for them.

  

• Mayday Premium "Lost Cities" Magnum Card Sleeves (50): Each pack of sleeves includes 50 sleeves. Count your deck before buying. A 50-sleeve pack may cover a single Lost Cities deck, but expansions or multiple copies will need more packs.

How to sleeve a Lost Cities card without damaging it

Work on a clean, dry surface and keep food or drinks away from the cards. These steps assume your cards measure within the 70 x 110 mm range.

1. Check the sleeve opening: Hold the sleeve with the opening facing up. Mayday Premium Magnum sleeves are clear, so you can see the card through the front as you insert it.
2. Insert the card slowly: Slide the card in short edge first, guiding it past the sleeve edges. Stop if you feel resistance; a correctly sized card should enter without forcing.
3. Seat the card fully: Push the card until it sits just below the sleeve opening, leaving a small margin at the top. This margin helps prevent the card edge from catching on the sleeve lip.
4. Press out trapped air: Lay the sleeved card flat and smooth it gently from the center outward. Do not bend the card or use sharp tools.

What the sleeve material means for card protection

• Mayday Premium "Lost Cities" Magnum Card Sleeves (50): Clear polypropylene, archival safe, acid free, no PVC. These material details matter if you plan to store cards long term or want to avoid sleeves that can degrade or stick over time.
• Mayday Premium "Lost Cities" Magnum Card Sleeves (50): 125% thicker than standard sleeves. Thicker sleeves add bulk to the deck, so check that your storage box or organizer still closes comfortably after sleeving.

Plan for the extra thickness

Because these sleeves are 125% thicker than standard sleeves, a fully sleeved Lost Cities deck will take up more room than the unsleeved cards. Before you sleeve the whole deck, test a small stack in your usual storage solution. If the lid lifts or the cards no longer sit flush, you may need to remove an insert, use a larger box, or accept a looser fit.

The same thickness affects shuffling. Thicker sleeves can feel stiffer at first, so shuffle gently and allow the sleeves to settle. Do not riffle or bend the cards aggressively to break them in.

Fit questions players ask

Will these sleeves fit every Lost Cities card?

They are sized for cards measuring 2.76" x 4.33" (70mm x 110mm). Measure your specific cards before sleeving; if they differ from that size, choose a different sleeve.

How many packs do I need for one Lost Cities deck?

Each pack contains 50 sleeves. Count your deck first, then buy enough packs to cover every card you plan to sleeve. Keep a few spares for replacements.

Are these sleeves safe for long-term storage?

The supplied product facts list them as archival safe, acid free, and made without PVC. Store sleeved cards in a cool, dry place and avoid direct sunlight.

Can I use Magnum sleeves for other games?

The catalog lists Lost Cities, Animalia, and Good for Day & Night as examples of cards this sleeve will fit. Always compare your card measurements to the 70 x 110 mm size rather than relying on the game name alone.

When Magnum sleeves are the wrong choice

Skip this sleeve if your cards are smaller than 70 x 110 mm, because the extra space allows the card to shift and can lead to bent corners. Also reconsider if you need a very compact storage solution; the added thickness is a real tradeoff for protection. Finally, if you prefer a specific sleeve texture or opacity, note that these are clear polypropylene sleeves, so the card face remains fully visible.