Will this store the Japanese 30 hole A4 paper?

The binder is designed for A4 format. It has two D-rings, that can be seen at the cut-outs on the front of the binder. Ergo, you need to punch 2 hoes into the paper. I have no idea what Japanese 30 hole A4 paper means. You may want to purchase a Leitz hole punch, which will punch two holes, and is adjustable for A4, US letter, A5, A6 and 888 formats.. Binder has a clasp that holds filed pages in place. Far superior to US system. Dr. WH

Thank you for your question. This binder is designed for A4 paper and features a 2-ring mechanism with 8cm spacing between the rings. B5 paper is smaller than A4; as long as your hole spacing is proper, this binder would accommodate your documents.

Will 9" x 12" sheets fit in this binder or is it too narrow? I'm having trouble finding a large-capacity binder in that size.

This binder is designed for A4 size paper but should still be large enough to accommodate documents that are 9" x12"

Is it wide enough for pocket sheets?

Unsure about the question. What's a pocket sheet?

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Leitz2-Ring 3-Inch Premium A4 Sized European Black Marbled Binder, Black (R80)Blue AngelThe Forest Stewardship Council

Leitz2-Ring 3-Inch Premium A4 Sized European Black Marbled Binder, Black (R80)Blue AngelThe Forest Stewardship Council

Product ID: 19143428

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Details

Color
Black
Material
Engineered
Capacity
6E+2 Pages
Brand
Leitz
Sheet Size

📄575-sheet capacity

📏8cm ring spacing

🗂️50% wider lever arch

Description

🗂️ Elevate your filing game with premium capacity and effortless style!

PRECISION A 4 FIT - Designed perfectly for A4 documents (8.27" x 11.7") to keep your files crisp and professional.
ECO CERTIFIED EXCELLENCE - Blue Angel & Forest Stewardship Council certified—organize sustainably and stylishly.
MASSIVE 575 SHEET CAPACITY - Store your entire project in one sleek binder—no more cluttered desks.
DURABLE EUROPEAN BLACK MARBLED FINISH - Engineered wood with a premium marbled look that commands respect in any meeting.
EFFORTLESS FILING WITH 50 WIDER LEVER ARCH - Experience smooth, strain-free opening and closing for quick access.

The Leitz2-Ring 3-Inch Premium Binder combines a robust 575-sheet capacity with a perfectly sized A4 format and an innovative 50% wider lever arch for comfortable filing. Crafted from engineered wood with a sophisticated black marbled finish, it’s both durable and eco-certified by Blue Angel and the Forest Stewardship Council, making it the ultimate choice for professionals who demand style, sustainability, and superior organization.

Specifications

Manufacturer	Bindertek
Brand	Leitz
Item Weight	14.4 ounces
Product Dimensions	3 x 12.5 x 11.3 inches
Item model number	R80-BK
Is Discontinued By Manufacturer	No
Color	Black
Material Type	Engineered Wood
Number of Items	1
Size	3" Spine
Sheet Size	8.3-x-11.7-inch
Number of Holes	2
Manufacturer Part Number	R80