Bubble Mint Stay Flat 9-pocket binder in pink lying completely flat, filled with K-pop photocards

bubble mint · premium stay flat zipper binder

Stays flat.
Hands free.

Ever tried organizing your cards while the binder keeps closing on you? Or filming your collection with one hand while the other holds the pages down? We're K-pop collectors too — so we built our first zipper binder around a rectangular spine that lies flat on the desk, from the first card to the last.

Pre-order open now · closes November 14, 2026 · 10% off at checkout$39.99 list, 10% off applied automatically at checkout · Ships from San Jose January 15, 2027 · from our international warehouse December 15, 2026
Pre-order nowSee the 4 colors

9 pockets · 20 double-sided pages · holds 360 cards · side-loading

The spine

Every other zipper binder has a round spine. This one doesn't.

Most zipper binders have a rounded spine that makes the pages curve and lift: stiff out of the box, never fully flat, and they need an almost full collection before they stop closing on you. Stay Flat has a unique rectangular spine, padded rigid covers and no rings, so it lies flat from the first page, empty or full. No more fighting your binder — just easier organizing, flipping and filming.

Side view of the Stay Flat binder showing the rectangular spine
Rectangular Stay-Flat spineThe reason it opens flat, empty or full.
Stay Flat binder open flat on a table
Opens flat from day one.No waiting for a full collection to hold it open — both hands free to sort, flip and film.

Why you'll love it

Made by collectors, for collectors.

🫧Stay-Flat designNo more fighting to keep your binder open.
💗Easier organizingUse both hands to arrange and flip through your cards.
📸Filming friendlyShow off your collection without holding the pages down.
✨Better viewingFlatter pages, a more comfortable browse.
🌸Color-matching pagesAn all-pink binder, inside and out — yes, even the pages.

Colors

Four colors, each with color-matching pages.

Imagine a fully pink binder, inside and out. Pick the color, and the pages come to match.

Stay Flat binder in WhiteWhitewhite pagesStay Flat binder in Light PinkLight Pinkpink or white pagesStay Flat binder in BlackBlackblack or white pagesStay Flat binder in YellowYellowyellow pages

Light Pink and Black are also available with white pages.

What makes it

Eight things we got right.

▭Rectangular Stay-Flat spineLies flat, empty or full.
🧱Padded rigid coversCardboard and sponge core protects the cards inside.
💧Water-resistant PU leatherDiamond-textured, wipes clean.
☁️Soft microfiber liningCovers never scratch a page.
🤐Smooth-glide zipperCloses all the way round, custom logo puller.
📄20 double-sided pages9 pockets a side, 360 cards.
🛡️PVC-free, acid-free PPArchival-safe for years of display.
↩Side-loading pocketsMichi-method friendly, cards stay put.

What fits

TCG cards and K-pop photocards, sleeved.

Pokémon cards in the Stay Flat binder
Pokémon · 66 × 91 mm sleeves
Magic: The Gathering cards in the Stay Flat binder
MTG · 66 × 91 or 67 × 92 mm sleeves
Yu-Gi-Oh! cards in the Stay Flat binder
Yu-Gi-Oh! · 61 × 91 mm sleeves
K-pop photocards in the Stay Flat binder
K-pop photocards · 61 × 91 mm sleeves

Pockets take sleeved and double-sleeved cards up to 67 × 92 mm. Not for toploaders.

Goes with it

Sleeves that fit this binder.

Every Bubble Mint sleeve is sized for the pockets: 66 × 91 mm frame, holographic and matte sleeves, and the 64 × 89 mm inner sleeves for double-sleeving.

[Soft Glow Series][Side-Loading][Double Sided] K-KEEP [A4 Standard] - 9 Pocket (68x95mm) - 11 Holes Premium Binder Pages, 100 Micron Thick(Pack of 10) - (V-10) For Pokemon, Magic, One Piece TCG Cards in 66x91mm Sleeves
[Soft Glow Series][Side-Loading][Double Sided] K-KEEP...$9.29
[Side-Loading][Double Sided] K-KEEP [A4 Standard] - 9 Pocket (68x95mm) - 11 Holes Premium Binder Pages, 100 Micron Thick, High Definition (Pack of 10) - (V-09) For Pokemon, Magic, One Piece TCG Cards in 66x91mm Sleeves
[Side-Loading][Double Sided] K-KEEP [A4 Standard]$9.29
[Side-Loading][Double Sided] K-KEEP [A5 Standard] - 4 Pocket (69x95mm) - 7 Holes Premium Binder Pages, 100 Micron Thick, High Definition (Pack of 10) - (V-05) Fits Any A5 Binder, for Pokemon TCG Cards in 66x91mm Sleeves
[Side-Loading][Double Sided] K-KEEP [A5 Standard]$7.99
[Soft Glow Series][Double Sided] K-KEEP [A4 PLUS] - 9 Pocket Standard (71x94mm) - 11 Holes Premium Binder Pages, 100 Micron Thick, Anti-Glare Matte (Pack of 10) - (W-925) Fits Pokemon, Monsta X, 66x91mm / 67x92mm Sleeves
[Soft Glow Series][Double Sided] K-KEEP [A4 PLUS]$11.99
[65x90mm] Meowcafe Premium Holographic CPP Photocard Sleeve - [Hologram Rainbow]
[65x90mm] Holographic CPP Photocard Sleeve · Hologram...$5.99

See the whole Bubble Mint collection →

Specs

Format9-pocket (3 × 3), zipper closure
Pages20 double-sided pages included · 360 cards
Pocket fitSleeved cards up to 67 × 92 mm · 66 × 91 mm TCG and 61 × 91 mm photocard sleeves
LoadingSide-loading pockets
ExteriorDiamond-textured PU leather, water-resistant, debossed logo on the front and inside cover
CorePadded rigid covers (cardboard + sponge)
InteriorSoft microfiber lining
Pages materialPP, PVC-free, acid-free
In the box1 binder with 20 pages, polybag and color box
Close-up of the Stay Flat binder pages and zipper
20 double-sided pagesClear, side-loading, matched to the binder color.

Pre-order

Open now through November 14, 2026

  • 10% off the binder during the pre-order, applied automatically at checkout — no code needed. Open now; closes November 14, 2026 at 11:59 PM PT.
  • Ships from San Jose on January 15, 2027 (US orders) · from our international warehouse on December 15, 2026 (DDP, duties and taxes included).
  • Pre-orders are final sale and cannot be cancelled.
  • Your whole order ships together with the binder, in-stock items included — order anything you need sooner as a separate order.
  • Limited first batch; each color has its own quantity.

Because your collection deserves more than storage. It deserves its own little gallery. Sneak peeks and launch updates on @bubblemint.meowcafe.

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