SHIPPING OCTOBER 2026
Introducing ULTBIAS with BT21 Minini
Exclusive officially licensed BT21 with ULTBIAS binder collection featuring the Minini.
Available in our two signature sizes: A5 Deluxe and A4 Duo
A5 Deluxe
Our most popular size suitable for collections now with the vibrant energy of the Minini!
A4 Duo
For the most sophisticated collectors with high capacity space. You're getting two binders in one case!
What's the difference
A4 vs A5
Custom A5 Deluxe
Fits up to x280 standard-size kpop photocards*
Total Storage Capacity: Fits up x35 double-sided sheets OR x55 single-sided sheets of ULTBIAS Custom A5 Pocket Pages.
Binder Dimensions: 240 x 255 x 85mm (9.4 x 10 x 3.3 in)
Outer Case Dimensions: 245 x 265 x 90mm (9.7 x 10.4 x 3.5 in)
Ring Type: Custom 3 D-Rings
Page Compatibility: 174 x 225mm (6.8 x 8.8 in) binder pages
*Using our Custom A5 4-Pocket Photocard Pages (Double-Sided)
Custom A5 Duo Edition
Fits up to x810 standard-size kpop photocards*
Total Storage Capacity: Up to 90x sheets of ULTBIAS Custom A4 Pocket Pages (Single-Sided) total.
The Duo Edition comes with 2x Single - Custom A4 myCOLLECTION Binders in one bespoke outer case.
Individual Binder Dimensions: 300 x 350 x 64mm (11.8 x 13.8 x 2.5 in)
Dual Outer Case Dimensions: 305 x 360 x 140mm (12 x 14.2 x 5.5 in)
Ring Type: 4 D-Rings
Page Compatibility: 242 x 319mm (9.5 x 12.6 in) binder pages
*Using our Custom A4 9-Pocket Photocard Pages (Single-Sided).
Each Binder Includes
What's Included
✓ Premium Binders
featuring the BT21 Minini
✓ myCOLLECTION accessories
including backboards, dividers and Binder Shield!
✓ Signature ULTBIAS quality
with archival-grade materials
✓ Official BT21 licensing
authentic partnership design
Made for Collectors, by Collectors
