--- title: "MUJI Open-Flat Lined Notebook: A5 and B6, 80 Sheets" canonical: "https://stationerytimes.com/guides/muji-open-flat-lined-notebook/" description: "MUJI High Quality Paper Open-Flat Lined Notebook explained: A5 21 × 14.8 cm and a 19.5 × 13.7 cm B6, 80 sheets (160 pages), lies flat, price band and origin." category: "Notebooks" type: "Softcover notebook" published: 2026-11-01 updated: 2026-11-01 author: "Ellis Penhale" publisher: "Stationery Times" sources: 2 products: - name: "MUJI High Quality Paper Open-Flat Lined Notebook (A5, B6; 80 sheets)" brand: "MUJI" brand_origin: "Japan" made_in: "Japan" material: "Paper; the page lists no cover material" price_band: "$$ ($5–20 per notebook, typical US retail, October 2026)" manufacturer: "Ryohin Keikaku Co., Ltd." model: "High Quality Paper Open-Flat Lined Notebook" gtin: "4550002185237" url: "https://www.muji.us/products/high-quality-paper-open-flat-lined-notebook" --- # MUJI Open-Flat Lined Notebook: A5 and B6, 80 Sheets > The MUJI High Quality Paper Open-Flat Lined Notebook is a lined notebook with 80 sheets (160 pages) that MUJI says opens flat so writing is easier. MUJI USA sells it in A5 (21 × 14.8 cm) and a B6 listed at 19.5 × 13.7 cm, and lists Japan as the country of origin. - URL: https://stationerytimes.com/guides/muji-open-flat-lined-notebook/ - Category: Notebooks - Author: Ellis Penhale - Published: 2026-11-01 - Updated: 2026-11-01 ![MUJI A5 and B6 notebooks closed and an A5 spread lying open flat with lined pages, drawn to scale](https://stationerytimes.com/images/raster/muji-open-flat-lined-notebook-illustration-16x9.png?v=24e7b5f8) *The A5 and B6 closed and an A5 open flat, to scale (1 mm = 1.43 px); the cover tint is a stand-in.* Original illustration made for this guide. © Stationery Times. Original drawing (SVG): . Drawings © 2026 Stationery Times, reusable with credit under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). ## Product facts | Product | Brand | Brand origin | Made in | Material | Released | Price range (typical US retail, October 2026) | |---|---|---|---|---|---|---| | MUJI High Quality Paper Open-Flat Lined Notebook (A5, B6; 80 sheets) | MUJI (by Ryohin Keikaku Co., Ltd.) | Japan | Japan | Paper; the page lists no cover material | – | $$: $5–20 per notebook | - Made in (MUJI High Quality Paper Open-Flat Lined Notebook (A5, B6; 80 sheets)): Japan. MUJI USA's product details give "Country/Region of Origin: Japan" for both sizes. Source: https://www.muji.us/products/high-quality-paper-open-flat-lined-notebook - Good for: Journaling and planning. ## Key takeaways - MUJI USA lists two sizes: A5 at 21.0 × 14.8 cm (8.3 × 5.8 in) and a B6 at 19.5 × 13.7 cm (7.7 × 5.4 in). - Each has 80 sheets (160 pages) of horizontal-lined paper that MUJI calls high quality. - MUJI says the notebook opens flat to make writing easier; the listing gives no binding type beyond its Bind tag. - MUJI USA lists Japan as the country of origin. - Both sizes are in our $$ band ($5–20); the A5 costs about a dollar more than the B6. ## What is the MUJI Open-Flat Lined Notebook? **It's a notebook of high-quality, horizontally lined paper that MUJI says opens flat to make writing easier.** MUJI is the brand of Ryohin Keikaku, the Japanese retailer. MUJI USA's tags describe a bound notebook, but the page doesn't name the binding. It costs more than MUJI's thin stitched notebooks and has far more sheets, so it's closer to a main notebook than a pocket pad. ## MUJI open-flat notebook specs | Spec | A5 | B6 (as MUJI lists it) | |---|---|---| | Size | 21.0 × 14.8 cm (8.3 × 5.8 in) | 19.5 × 13.7 cm (7.7 × 5.4 in) | | Sheets | 80 (160 pages) | 80 (160 pages) | | Ruling | Horizontal lines | Horizontal lines | | Barcode | 4550002185237 | 4550002185626 | | Made in | Japan | Japan | MUJI USA gives no paper weight, line spacing or cover material. The B6 figure is larger than the 12.5 × 17.6 cm ISO B6 sheet, so MUJI's number likely measures something else, but the page doesn't say. ![MUJI open-flat notebook A5 and B6 outlines drawn to scale side by side](https://stationerytimes.com/images/muji-open-flat-lined-notebook-sizes.svg?v=7e6b6e04) *The listed B6 is 1.5 cm shorter and 1.1 cm narrower than the A5. Original illustration made for this guide. © Stationery Times.* ## Who is the MUJI open-flat notebook for? **It suits people who want one lined notebook with plenty of pages that stays open under their hand.** - **Journaling and planning:** 80 sheets (160 pages) of horizontal-lined paper that MUJI says opens flat for easier writing. Skip it if you need to know how it handles fountain pen ink or highlighters: MUJI USA gives no paper weight. ## How long does an 80-sheet notebook last? **80 sheets is 160 pages, so one page a day lasts about five months.** That's our arithmetic, not MUJI's. It's also 2.7 times the 60 pages of MUJI's recycled paper notebook. A sheet is one leaf with a page on each side. If you write on only one side to avoid show-through, you get 80 usable pages. MUJI USA gives no paper weight, so we can't say whether the reverse side stays clean. ## Which MUJI open-flat notebook size should you choose? **Choose the A5 if you want the common size; the B6 is only about a centimetre smaller each way.** A5 is the size most planners and covers are built for, and at 8.3 × 5.8 in it fits easily inside a US letter (8.5 × 11 in) folder. See our [A5 vs B5 notebooks](https://stationerytimes.com/guides/a5-vs-b5-notebooks/) guide for how sizes compare. The B6 costs about US$1 less when we read MUJI USA's page on November 1, 2026. ## How does it compare with other MUJI notebooks? **It has the most sheets of MUJI's lined notebooks we cover, and it's the only one MUJI says opens flat.** | | Open-Flat | [Recycled Paper](https://stationerytimes.com/guides/muji-recycled-paper-notebook/) | [Planted Tree Paper](https://stationerytimes.com/guides/muji-planted-tree-paper-notebook/) | |---|---|---|---| | Sheets | 80 (160 pages) | 30 (60 pages) | 36 per notebook | | Binding | Not stated | Thread-stitched | Stitched, cloth spine | | Made in | Japan | Japan | Indonesia | | Price band | $$ | $ | $ | Our [best notebooks](https://stationerytimes.com/guides/best-notebooks/) roundup compares everyday notebooks across brands. ## Where is the MUJI open-flat notebook made? **In Japan: MUJI USA gives it as the country or region of origin for both sizes.** ## How much does the MUJI open-flat notebook cost? **Both sizes are in our $$ band ($5–20).** MUJI USA lists the A5 about a dollar above the B6. MUJI USA sells it as Final Sale, with no refunds or exchanges. ## Frequently asked questions ### How many pages does the MUJI open-flat notebook have? MUJI USA lists 80 sheets, which is 160 pages, for both the A5 and the B6. ### What size is the MUJI open-flat notebook? MUJI USA lists an A5 at 21.0 × 14.8 cm (8.3 × 5.8 in) and a B6 at 19.5 × 13.7 cm (7.7 × 5.4 in). ### Is MUJI's B6 the same as standard B6? MUJI's figure of 19.5 × 13.7 cm is larger than the 12.5 × 17.6 cm ISO B6 sheet size. MUJI doesn't say what its figure measures, so treat it as the notebook's listed size. ### Does the MUJI open-flat notebook really lie flat? MUJI says it opens flat to make writing easier. We haven't tested it, and the listing doesn't name the binding. ### Is the MUJI open-flat notebook ruled or dotted? MUJI USA describes horizontal-lined paper. The product's tags mention dotted and grid layouts, but the description names only horizontal lines, so check the page you're buying. ### Is the MUJI open-flat notebook good for fountain pens? MUJI calls the paper high quality but gives no paper weight or ink test, so we can't say yet. Our best notebooks for fountain pens roundup lists tested options. ### How is it different from the MUJI recycled paper notebook? It has 80 sheets against 30, lies flat according to MUJI, and costs more: MUJI's recycled notebooks sit in our $ band. ## Sources - [MUJI USA: High Quality Paper Open-Flat Lined Notebook (A5 and B6 sizes, 80 sheets / 160 pages, horizontal lines, opens flat, Japan; read in full November 1, 2026)](https://www.muji.us/products/high-quality-paper-open-flat-lined-notebook) - [MUJI USA stationery collection (product list, read November 1, 2026)](https://www.muji.us/collections/stationery)