Every collector eventually ends up with more coins than album ports, and this is where they end up — 2x2 by 2x2, stapled shut, filed in a box. Get the choice right once and you never have to think about it again.
The 2x2 cardboard coin holder is the single most-used individual storage format in numismatics. It's cheap, it's standardized, it's stackable, and — if you buy the right one — it's chemically safe for indefinite storage of silver, gold, copper, and everything else in the vintage US coin universe. The if is important, because a significant portion of 2x2s and flips still sold today use materials that will damage coins over years. Getting this right matters more than any other supply decision except album choice.
This guide covers the six product lines worth considering: BCW, Guardhouse, Saflip, Numis, and H.E. Harris cardboard 2x2s, plus Kointain rigid inserts that fit into a 2x2 for extra protection. It also covers the mylar-versus-PVC rule that governs the whole category, how to actually staple a 2x2 correctly, and when to reach for a slab or an Air-Tite capsule instead.
The One Rule That Ends the PVC Discussion
Never store coins in PVC flips. Ever. Not for a week, not "just until I get to the coin show," not even for coins you don't particularly care about. PVC (polyvinyl chloride) flips look almost identical to mylar flips — both are clear, both are the same 2x2 form factor, both cost a few cents each — but PVC uses plasticizers that outgas over time and deposit a sticky green residue on the coin's surface. That residue is called PVC damage, and it's chemically bonded to the metal. It requires professional conservation to remove, and it often leaves permanent etching underneath.
Safe flip materials are mylar (a trade name for biaxially-oriented polyester), other polyester formulations sold under names like Saflip or Numis, and cellulose acetate. All three are chemically inert on the timescales that matter for coin storage. Unsafe flip materials include PVC and any "vinyl" flip that doesn't specifically state it's non-PVC.
If you inherit a coin collection stored in flips and any of the flips have coins with a greenish sticky residue, or the flips themselves feel oily or emit a distinct chemical smell, the flips are PVC and the coins have already begun sustaining damage. Move the coins to mylar 2x2s or Air-Tites immediately. For coins with visible residue, consult a professional conservator (NCS at NGC or PCGS Restoration) rather than trying to clean the residue yourself.
The Two Format Families
Everything sold as a "2x2" falls into one of two format families:
Cardboard 2x2s. A 2-inch by 2-inch cardstock rectangle with a clear mylar window in the center. The coin sits in the window, the cardboard is folded in half over the coin, and the perimeter is stapled shut. Cardboard 2x2s are the standard long-term storage format for raw (non-slabbed) coins. They cost pennies each in bulk, they stack neatly in 2x2 boxes, and they hold up for decades if kept in a controlled environment.
Plastic flips. A one-piece polyester or acetate sleeve, 2-inch by 2-inch, that opens like a book. Coin slides into one pocket; the other pocket typically holds a paper insert with your notes on grade, date, or provenance. Plastic flips are useful for coins that will move often (auction submissions, coin show trading, temporary storage during grading submissions), because they don't require stapling and can be reopened without destruction. Not as durable as stapled cardboard 2x2s for long-term storage.
| Denomination | 2x2 Size Name | Also Fits |
|---|---|---|
| Cent | Small (1") | All Lincoln, Indian Head, and small cents |
| Nickel / Dime | Nickel or Dime | All Jefferson, Buffalo, Roosevelt, Mercury, Barber dimes |
| Quarter | Quarter | Washington, Standing Liberty, Barber quarters |
| Half Dollar | Half | Kennedy, Franklin, Walking Liberty, Barber halves |
| Small Dollar | Small Dollar | Susan B. Anthony, Sacagawea, Presidential |
| Large Dollar | Large Dollar (1.5") | Morgan, Peace, Trade, Seated Liberty, all pre-1979 silver dollars |
The Six Picks
BCW Mylar Cardboard 2x2s
$BCW's cardboard 2x2s with mylar windows are the workhorse of the collectibles supply world — high volumes, consistent sizing, safe materials, low prices in bulk. Available in every standard US coin denomination, plus specialty sizes for foreign coinage and tokens. This is the default recommendation for any collector storing raw coins in 2x2 format.
The cardboard weight is standard (not premium), the mylar window sits flush and doesn't buckle, and stapled 2x2s stay closed reliably. For collectors handling hundreds or thousands of raw coins, buying BCW in packs of 100 or 500 is the standard approach.
Guardhouse Cardboard 2x2s
$$Guardhouse (the same company that makes Guardhouse coin capsules) makes cardboard 2x2s with higher cotton-content cardstock and slightly more rigid mylar windows than the standard BCW offering. The premium is real but modest, and for higher-grade uncirculated silver where you want the extra assurance against long-term surface issues, Guardhouse is worth the upgrade.
Widely available through numismatic supply houses. Available in the same size range as BCW. Slightly more expensive per unit but not so much that it changes bulk-buying economics for most collectors.
Saflip Vinyl-Free Flips
$$Saflip is a brand name for a vinyl-free polyester plastic flip — the safe alternative to PVC flips for any application where you need a flip rather than a stapled 2x2. Two-pocket design (coin in one pocket, insert card in the other) makes them the standard format for auction submissions, coin show trading, and grading-service submission packaging. Reopenable without destruction.
Saflips are what dealers use at coin shows. Non-PVC, dimensionally stable, and safe for indefinite short-to-medium-term storage. For very long-term storage, stapled mylar cardboard 2x2s or Air-Tites are still preferred, but Saflips are the correct format any time a flip specifically is what you need.
Numis Non-PVC Mylar Flips
$$$Numis (owned by Lindner, the German coin supply manufacturer) makes premium non-PVC mylar flips that are the default choice among European collectors and increasingly popular with US collectors handling world coinage. Cleaner mylar quality than most competitors, tighter dimensional tolerances, and available in specialty sizes for European denominations that US-focused brands don't stock.
Priced above BCW and Saflip. Worth the premium if you're collecting world coinage in addition to US, or if you specifically want the highest-quality flip on the market and don't mind paying for it.
H.E. Harris 2x2 Flips
$H.E. Harris (owned by Whitman) makes the cheapest widely-available cardboard 2x2s with mylar windows. Not as consistent as BCW in dimensional tolerances, not as premium as Guardhouse, but perfectly safe for the price point and widely stocked at every coin shop and most bookstores. If BCW isn't available and you need 2x2s locally on short notice, H.E. Harris is what you'll find.
Not the recommendation for a permanent collection storage system, but perfectly fine for sorting operations, kids' collections, and coin roll hunting output that will get re-sorted and moved.
Kointain Sonic-Sealed Inserts
$$$Kointain makes rigid, sonic-sealed polyester capsules sized to fit inside a standard 2x2. The coin sits inside the rigid capsule; the capsule sits inside the 2x2. You get the benefits of a rigid airtight capsule (no coin movement, better dust protection, no direct mylar-to-coin contact) with the storage convenience of the 2x2 format (fits in standard 2x2 boxes, standard labeling).
More expensive per unit than plain 2x2s. Worth it for higher-grade coins where you want capsule-level protection without the size and expense of full Air-Tite capsules or the commitment of third-party grading. Common bridge product between raw 2x2 storage and slab submission.
BCW, Guardhouse, and Saflip at BCW Supplies
BCW Supplies carries their own 2x2s alongside Guardhouse, Saflip, and Kointain — one-source ordering across the entire category. Bulk pricing kicks in at 100- and 500-unit quantities and is the standard way most collectors buy.
Shop 2x2 Holders at BCWThe Three-Staple Pattern
The single most-common mistake beginners make with 2x2s is inadequate stapling. A 2x2 with one staple at the top and one at the bottom will flex at the corners, allowing the coin to shift inside the mylar window and pick up hairline scratches from the movement. A 2x2 with staples too close to the coin can flex the mylar into contact with the coin surface. Neither is what you want.
The correct staple pattern is three staples in a triangle:
- One staple centered on the top edge, roughly halfway between the coin edge and the outer cardboard edge.
- One staple centered on the left edge (or right — pick a side and stay consistent).
- One staple centered on the right edge (or opposite the second one).
The bottom edge (the folded edge of the cardboard) doesn't need a staple — it's already closed. The three-staple triangle keeps all four corners locked and prevents any corner from flexing. After stapling, use a flat-nose pliers or a stapler flattener to compress the staple flush against the cardboard so the 2x2 stacks flat in a 2x2 box without the staples catching on adjacent 2x2s.
Most collectors use a standard office stapler with regular staples. Some prefer a dedicated coin-supply flat-clinch stapler that flattens staples automatically. Both work. If you're doing high volumes (hundreds of 2x2s at a time), the dedicated stapler is worth the small investment for consistency and hand fatigue.
Storage of Stapled 2x2s
Once coins are in 2x2s, they need somewhere to live. The standard format is a 2x2 storage box — a corrugated or plastic box with rows of slots sized to hold stapled 2x2s upright, like index cards in a filing box. Capacities range from 100-slot boxes (single-row) up through 1000+ slot boxes (multi-row).
BCW, Guardhouse, and other suppliers make 2x2 boxes in wood, corrugated cardboard, plastic, and metal. Wood boxes look premium but cost more; corrugated boxes are the standard for volume storage; plastic boxes are the most humidity-resistant. All are fine choices — pick based on aesthetics, cost, and how many 2x2s you need to store.
Store 2x2 boxes in a climate-controlled interior room, away from direct sunlight and away from sulfur sources (rubber, some carpets, cardboard boxes that aren't archival-rated). Silica gel packs in the same storage space reduce ambient humidity. A closet or interior shelf beats a display case near a window every time — the storage principle is identical to album storage.
When to Skip 2x2s Entirely
Three specific situations where a 2x2 isn't the right answer:
Coins worth more than the cost of grading. If a coin is worth more than about $150-200, it's usually worth submitting to PCGS, NGC, or CACG for authentication and encapsulation. The certified slab is both better protection and adds marketable value at resale. The specific dollar threshold depends on current grading service costs and the specific coin, but the general rule stands: high-value coins go in slabs, not 2x2s.
Long-term hold on uncirculated silver. For MS-63 and higher uncirculated Morgan or Peace dollars you plan to hold for decades, Air-Tite capsules are a better protection choice than 2x2s — the rigid air-sealed acrylic is more protective against both physical contact and atmospheric exposure than any 2x2 format. Cost per unit is higher but the protection is meaningfully better for coins where surface preservation matters most.
Coin roll hunting output during active sorting. Coins moving in and out of storage rapidly during sorting don't need to be stapled into 2x2s. Coin tubes (rigid plastic tubes sized to each denomination) are the right tool for temporary bulk storage during sorting operations. Move to 2x2s only when a coin has been evaluated and is going into permanent storage.
2x2 Coin Holders and Storage Boxes on eBay
Bulk 2x2 lots, out-of-production specialty sizes, and vintage 2x2 storage boxes all move regularly on eBay. Useful for finding unusual sizes (colonial-era coins, world silver crown sizes) that current retail supply houses don't stock.
Where to Go Next
For rigid capsule storage of higher-value coins, see the Air-Tite capsule guide. For album storage of full series sets, see the coin album guide. For coin tubes for bulk temporary storage, see the coin tube comparison. For long-term secure storage of an entire collection, see the safe buying guide. And for the underlying collecting decisions, the pre-1965 collecting guide covers series selection and buying strategy.
- The one rule
- Never PVC. Mylar or non-PVC polyester only, for every coin, every time.
- Best overall
- BCW mylar cardboard 2x2s — safe, cheap, widely available
- Best premium cardboard
- Guardhouse cardboard 2x2s — higher cotton content, better tolerances
- Best plastic flip
- Saflip vinyl-free polyester flips — the dealer standard for shows and submissions
- Best rigid insert
- Kointain sonic-sealed capsules — capsule-grade protection in 2x2 form factor
- Staple pattern
- Three staples in a triangle; flatten each staple flush after placement
- When to skip 2x2
- Coins over ~$150-200 (grade instead), long-term uncirculated silver (Air-Tite instead)
Frequently Asked Questions
A 2x2 is a 2-inch by 2-inch cardboard coin holder with a clear mylar window in the center. The coin sits in the mylar window, the cardboard is folded in half, and the perimeter is stapled shut, sealing the coin inside. It's the workhorse individual-coin storage format for collectors — cheap, standardized, and stackable into 2x2 storage boxes.
No. PVC (polyvinyl chloride) flips use plasticizers that outgas over years and leave a sticky green residue on coin surfaces. That residue is chemically bonded to the metal and requires professional restoration to remove — and even then it often causes permanent damage. Use only mylar (polyester) or Saflip-brand polyester flips for any coin you intend to keep. If you have coins in old PVC flips, move them to mylar immediately.
Use a standard staple gun or heavy-duty office stapler with three staples in a triangle pattern: one on each of the three closed sides, halfway between the coin and the outer edge. The three-staple pattern keeps the holder from flexing at any corner, which prevents the coin from shifting and rubbing against the mylar window. Flatten each staple after placement so it lies flush against the cardboard.
In 2x2 storage boxes designed for the format — typically corrugated or plastic boxes with rows of slots sized to hold stapled 2x2s upright, like index cards in a filing box. BCW, Guardhouse, and other suppliers make 2x2 boxes in various capacities (100, 500, 1000+ 2x2s per box). Store the boxes in a climate-controlled interior room; the box adds a layer of physical protection but does not seal out humidity or airborne contaminants.
Large dollar size (sometimes labeled "silver dollar" or "large dollar"). This is the same size used for Peace dollars, Trade dollars, and Seated Liberty dollars. The smaller "small dollar" size is for Susan B. Anthony, Sacagawea, and Presidential dollars, which are physically smaller than the pre-1979 silver dollar denominations. Always match the 2x2 size to the specific coin — an oversized 2x2 lets the coin shift; an undersized one won't close over the coin.