Portal guides · Binders
Pick up a binder, turn it on its side, and shake it gently. If a card moves, the pockets are top loading. That is the whole test, and the number of collectors who have run it by accident, on the way home from a card show, is why this guide exists.
Side loading and top loading pockets look identical on the page. They behave completely differently in a bag, on a shelf and in the hand. Here is what each does, the one claim about side loading that is folklore, and why it is the first spec we check on any binder.
Last checked: 5 September 2026. No prices or counts in this one. Recheck if the binder base changes its pocket design.
The short answer
- Top loading pockets open at the top. Tip the binder and gravity takes the card.
- Side loading pockets open towards the spine. A card has to travel sideways and then out, which it never does on its own.
- A zip does not fix top loading. The card stays in the binder but leaves its pocket, and a loose card between pages gets pressed and creased.
- Side loading lets a binder stand upright on a shelf like a book, which is the best way to store one.
- Every Portal binder is side loading. It costs a little more to make and it is not negotiable.
What the two pockets actually do
One opening faces up. The other faces the spine. Everything follows from that.
A top loading pocket is open along its top edge. You drop the card in from above, which is quick, and the card sits on the bottom seam of the pocket. Nothing holds it there except gravity, so when gravity changes direction, the card follows.
A side loading pocket is open along the edge that faces the binder's spine. You slide the card in sideways. When the binder is closed, every pocket opening on both pages faces inward, towards the spine, so there is no orientation of the binder in which a card can simply fall out. To leave its pocket a card has to be pulled.
That is the entire difference in construction. The difference in outcome is a card show binder that comes home with every card in its slot, or one that does not.
TipHow to tell in the shop
Look at the inner edge of a page, the one nearest the spine. If the pocket opening is there, it is side loading. If the openings are along the top of the page, it is top loading. Product listings do not always say, and cheaper binders often do not because the answer is top.
The bag, the shelf and the hand
Three everyday situations, and what each pocket does in them.
The bag. A binder in a rucksack spends its journey on its side or upside down. Top loading pockets empty a little on every step. The cards do not leave a zipped binder, but they leave their pockets, and a loose card pressed between two full pages arrives with a bent corner or a crease along the edge.
The shelf. A side loading binder can stand upright like a book, zip closed, with nothing resting on its pages. That is the best way to store a binder. A top loading binder stood upright slowly empties its top row into the gap between pages, so it has to lie flat, and flat binders get stacked, and stacked binders press on the cards inside.
The hand. Show a page to a friend by holding the binder open and tilting it towards them. With top loading pockets the top row is now leaning out of its openings. With side loading, nothing moves.
Commonly saidA zip binder makes top loading pockets safe
Half true, which is the dangerous kind. The zip keeps the card inside the binder, so it will not be lost. It does nothing to keep the card inside its pocket. A card that has slid out of a top loading pocket sits loose between two pages, where it gets pressed, shifted and creased. A zip stops loss. Side loading stops damage.
Loading, wear and the one real downside
Honest about the trade off, because there is one.
Side loading takes a fraction longer. You angle the sleeved card into the opening and slide it home rather than dropping it in, and for the first few pages it feels fiddly. After one binder it is automatic. For a trade binder that gets reloaded constantly, that fraction is the only real argument for top loading.
On wear, side loading is gentler. Sliding a sleeved card in from the side puts less strain on the pocket seam than pushing it down from the top, and because the card is not repeatedly dropping onto the bottom seam, the pocket keeps its shape for longer. The claim that side loading pockets stretch out faster is one we have never seen supported and it does not match how the pocket is stressed.
One more practical point. Always sleeve the card before it goes in. A sleeve makes a side loading pocket easier to load, not harder, because the sleeve's smooth surface slides where a bare card catches, and it protects the card from the pocket edge on the way in.
Portal takeEvery binder we print is side loading, because every one is a set binder or a display binder that will be carried, shown and shelved. It is the first spec we check on anyone else's binder and the first thing we would tell a new collector to look for.
The rest of the binder checklist
Loading is the one people miss. It is not the only one.
Side loading pockets are one of six things a binder decision turns on. The others are pocket count, closure, rings, page material and capacity, and the full walk through is in which Pokemon binder should you buy.
The six, in one line each
- Loading: side loading, so cards cannot fall out.
- Closure: a full edge zip, so dust and light stay out. See zip, strap or elastic.
- Rings: bound pages with no rings, so nothing presses on the inside column.
- Pages: acid free, PVC free polypropylene.
- Pocket count: 9 for sets, 12 for bulk. See 9 pocket versus 12 pocket.
- Capacity: 360 sleeved cards per 20 page 9 pocket binder. Check the set's master set count first.
Questions people actually ask
What is a side loading binder?
A binder whose pocket openings face the spine rather than the top of the page. Cards slide in sideways and, when the binder is closed, every opening faces inward, so no orientation of the binder lets a card fall out. Every Portal binder is side loading.
Are side loading binders better than top loading?
For any binder that is carried, shown or stored upright, yes. Top loading pockets let cards slide out whenever the binder is tipped. Side loading pockets do not. The only argument for top loading is a fraction of a second saved loading each card, which matters only on a trade binder reloaded constantly.
Can cards fall out of a side loading binder?
Not on their own. A card would have to travel sideways towards the spine and then out, against the closed opposite page. In practice cards leave a side loading pocket only when pulled.
Does a zip stop cards falling out of top loading pockets?
It stops them leaving the binder, not their pockets. A card that slides out of a top loading pocket sits loose between pages, where it is pressed and creased. A zip prevents loss. Side loading prevents damage.
Do side loading pockets stretch or wear out faster?
We have seen no evidence for that and it does not match how the pocket is stressed. Sliding a sleeved card in from the side is gentler on the seam than dropping it onto the bottom of a top loading pocket. Sleeve the card and the pocket keeps its shape for years.
How do I tell if a binder is side loading before buying?
Look for the pocket opening on the inner edge of the page, nearest the spine. If the openings run along the top of the page it is top loading. Listings that do not say are usually top loading. Portal binder listings state side loading in the specification table.
Turn the binder on its side. If a card moves, that binder is for bulk, not for the set you care about.
Side loading, zipped, standing upright on the shelf. That is a binder doing its job while you are not looking.
Collect better.
Where these numbers came from
- Portal TCG binder listings and the COVRD 9 pocket zip binder spec: side loading pockets, bound pages, full edge zip
- Portal TCG guide: How to protect and store your collection: the binder section this guide expands on
The binder guides
Side loading as standard
Pokemon binders
9 pocket zip binders with side loading pockets and bound pages. Plain from £24.99, printed to order from £49.99.
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