A top loader is open on one edge and welded on the other three. Whatever goes in comes out the same way, and the holder looks identical either way. That open 3" edge is the only opening on the whole thing, which makes it the obvious place for a numbered mark — and the number itself is just a prefix and a starting figure you type on the builder.
Top loaders do not get wider or taller
A 3" x 4" top loader stays 3" x 4" across the whole point ladder. Only the depth changes — 1/16" at standard 20pt, 25/64" at 360pt, with the rest in between. Same footprint, one seal size for the range.
Two things before you order anything off a point number. It is the inner opening in thousandths of an inch — not the outside thickness, not the card thickness. And the ladders differ by brand: BCW sells 59/79/108/138/168/197/240/360pt, Ultra Pro sells 35/55/75/100/130/180/240/360pt, so a BCW 59pt and an Ultra Pro 55pt are near-equivalents rather than the same part. The thicknesses below are BCW's published exteriors. Suppliers revise parts, so check the current spec for the holder you actually buy.
Where the Serial Seal™ goes
Use a FOLD Serial Seal™, wrapped over the open 3" top edge. The other three edges are factory welds, so a seal there is a mark on a closed side rather than a mark on the opening.
The seal is 0.75" x 1.77". Across a 3" edge, the 0.75" width covers 25% of that edge. The 1.77" length is what splits across the two faces:
per-face landing = (1.77 - T) / 2
T is the thickness of the edge you are wrapping. Halving 1.77 to get 0.885" per face is the zero-thickness upper bound and nothing else. On a thick top loader it overstates your grip by more than 20%.
| Top loader (BCW) | Exterior thickness | Landing on each face | Share of the 4" face |
|---|---|---|---|
| Standard / 20pt | 1/16" (0.0625") | 0.854" | 21% |
| 59pt | 1/8" (0.125") | 0.823" | 20% |
| 79pt | 5/32" (0.156") | 0.807" | 20% |
| 108pt | 13/64" (0.203") | 0.783" | 19% |
| 240pt | 5/16" (0.3125") | 0.729" | 18% |
| 360pt | 25/64" (0.391") | 0.690" | 17% |
Even at 360pt each face still gets 0.690" of vinyl. On our own bench, folds start feeling unreliable somewhere around 0.55" to 0.58" per face — handling experience, not a measured threshold, and it moves with the surface, the prep and how hard you press. Every holder on this ladder sits clear of it. Still, put one on the exact holder you ship and handle it for a day before you buy a long run.
Offset it, do not center it
Most 3x4 top loaders have a thumb notch cut into the front wall at top center to help you get the card out. A fold placed dead center spans that notch, sits on air across part of its width, and dimples or lifts there.
Offset the seal about 0.6" from center. That clears the notch and still leaves roughly 0.4" of margin to the side weld.
If you care about the front window
Rigid PVC takes this adhesive well, and the bond can be firm enough that pulling a seal off leaves a haze where it sat — on the front face, that haze lands over the card image. Two ways around it. Keep the fold in the top 0.85" of the front face, where the card's top border sits rather than the artwork. Or fold over the bottom edge instead: that is a factory weld, so the seal is a numbered mark that does not sit on the opening at all, but the window stays clear. Both orientations are available.
Front face or bottom weld is a per-holder call, not a purchasing one: the point ladder never changes the footprint, so the builder never asks what thickness you run.
Step by step
- Sleeve the card, then load it into the top loader. The adhesive never touches the card or the sleeve. If you are tempted to seal the sleeve itself, read how to seal a penny sleeve first — the short version is do not.
- Wipe the top 1" of both faces with a dry microfiber cloth. PVC picks up a static film in storage, which adhesive dislikes.
- Find the thumb notch on the front wall and mark your offset: about 0.6" left or right of center.
- Photograph the loaded holder before you seal it, front and back, with the card visible.
- Peel the seal and land the leading half on the front face, top edge of the seal flush to the top edge of the holder. Roll it over the edge and press it onto the back.
- Burnish both faces with a thumb, working from the crease outward so no air is trapped at the fold.
- Log the serial number against the order — order number, date, card. A spreadsheet line is enough. This is the step that actually matters.
- Take a second photo with the applied seal and its number legible in frame, and file it with the order.
What this does and does not do
A seal on a top loader is numbered thin film with adhesive on a disposable plastic holder. It is not proof of authenticity. It does not show that a holder was never opened, and it says nothing about the card inside it.
The stock is thin holographic vinyl on a permanent adhesive. How it behaves coming off depends entirely on what it was stuck to — rigid PVC holds it hard, thin poly film does not. We do not test removal behaviour and we do not claim any. A top loader seal can be peeled off and a different seal put down in its place, on the same holder, by anyone holding a spare seal. None of that changes what you are buying. The seal carries a number, and the number is only worth something because you photographed it and wrote it down.
That is also the answer to "why not a hologram sticker out of a pack of 500." Five hundred identical stickers support one statement: something was sealed. A numbered run supports a different statement per holder — this holder, this order, this date — and that is the kind of statement a photo can be checked against. You choose the prefix and the starting number, we print the run in sequence, and no two seals in your order carry the same number.
Some layouts carry VOID IF DAMAGED. On a top loader that is print on vinyl sitting on a holder that costs a few cents. It announces something. It does not do anything.
If a buyer opens a case over a card you shipped in a sealed holder, the marketplace runs its own process and reaches its own conclusion. What you can hand over is the pre-seal photo, the post-seal photo and the serial logged against the order. The return-fraud page covers how sellers use that record.
How many do you need
Count holders, not cards. One fold per top loader, so your number is the singles you ship in a normal week times the weeks you want to cover, plus a few for the ones you land crooked, plus any shelf stock you seal before it sells.
60 Serial Seal™ minimum · From $30.00 · As low as $0.30 each in bulk. No setup, die, or design fees. Commercial license & copyright included.
Run it on your own figures. Four a week for a year is a bit over 200 holders: 300 seals is $135.00, or 45c each. Twelve a week for a year is around 620 — 600 seals is $240.00 at 40c. Thirty a week clears 1,500, and 1,560 seals is $561.60 at 36c; keep climbing and the rate keeps stepping — 33c at 2,400, then 30c at 4,200, and 30c is the floor: it does not move below that however far up you go, and self-serve tops out at 10,008 — for bigger runs ask us for a quote. Seals come in twelves at $6.00 a pack, and the rate steps down on its own at checkout: one tier per order, no code to enter. To try the fold on your own holders first, the 60-seal minimum is $30.00. Set the quantity on the builder. Bundles change the arithmetic — how to seal a break stack covers one fold across several cards.
Common mistakes
- Centering the fold. It bridges the thumb notch, sits on air and lifts at the crease. Offset 0.6".
- Sealing the sleeve instead of the holder. Once the sleeve mouth is sealed you cannot get the card out without flexing it past the seal. Seal the top loader; leave the sleeve alone.
- Assuming point size changes the footprint. It does not. If a supplier tells you a 130pt needs a wider seal, they are wrong.
- Letting adhesive reach inside the opening. Land the seal flush with the top edge, not overhanging it. Adhesive that curls into the mouth of the holder can touch the card edge.
- Skipping the photo. A sealed holder with a number on it and no record attached to the order is just thin film with adhesive.
Questions people ask
Do I need a different seal size for thick top loaders?
No. The footprint is the same from 20pt to 360pt; only depth changes. One 0.75" x 1.77" fold gives 0.854" per face on a standard holder and 0.690" on a 360pt.
Can I put the Serial Seal™ on the card itself?
No. Never put adhesive on a card, and never on a penny sleeve with a card of value inside it. Seal the holder, the bag, the box or the package — not the collectible.
Fold or single on a top loader?
Fold, if you want the seal to sit across the open edge — the 3" top is the only unsealed one. A single lying flat on one face is fine if you just want a numbered mark on the holder.
Will the Serial Seal™ come off cleanly if I want to remove it?
We do not test removal and we will not claim an answer either way. What we can say about the substrate: a permanent adhesive on rigid PVC tends to hold hard and can leave a haze, which is why the placement above keeps the fold off the card image. If it matters to your workflow, peel one off a spare holder and see what you get.
What you are buying: holographic vinyl folds, numbered in sequence from your own starting figure, one per holder. Sixty is the minimum order at $30.00, 50c each; at 600 the rate is 40c, and it keeps stepping down to 30c at 4,200, where it holds, with runs past 10,008 quoted. Take a gallery design on the builder or put your own logo on it at add a logo. Ordering questions: the FAQ. Other formats: where to put a seal on every card format.
Serial Seal is an independent printer. We are not affiliated with, endorsed by or sponsored by PSA, Beckett, CGC, SGC, Ultra Pro, BCW, eBay, Whatnot, TCGplayer or any card manufacturer. Brand names are used only to describe the products they make. Nothing here is legal advice.