--- title: "MUJI Aluminum Pen Case: Size, Fit & Material" canonical: "https://stationerytimes.com/guides/muji-aluminum-pen-case/" description: "MUJI Aluminum Pen Case explained: 62 × 175 × 15 mm outside, 60 × 173 × 13 mm inside, which pens and pencils fit, anodised aluminium, price band and origin." category: "Cases" type: "Pen case" published: 2026-10-21 updated: 2026-10-21 author: "Ellis Penhale" publisher: "Stationery Times" sources: 5 products: - name: "MUJI Aluminum Pen Case, flat type (about 62 × 175 × 15 mm)" brand: "MUJI" brand_origin: "Japan" made_in: "China" material: "Aluminium alloy body with an alumite (anodised) surface" price_band: "$$ ($5–20 per case, typical US retail, October 2026)" manufacturer: "Ryohin Keikaku Co., Ltd." model: "82998177" gtin: "4550182998177" url: "https://www.muji.com/jp/ja/store/cmdty/detail/4550182998177" --- # MUJI Aluminum Pen Case: Size, Fit & Material > The MUJI Aluminum Pen Case is a slim aluminium box for a few pens. MUJI Japan lists it at about 62 × 175 × 15 mm outside and 60 × 173 × 13 mm inside, in anodised aluminium alloy, made in China. Pens up to about 17 cm long fit, so most gel pens do but a new pencil doesn't. - URL: https://stationerytimes.com/guides/muji-aluminum-pen-case/ - Category: Cases - Author: Ellis Penhale - Published: 2026-10-21 - Updated: 2026-10-21 ![MUJI Aluminum Pen Case closed in three-quarter view, and a plan view of its inside holding three pens](https://stationerytimes.com/images/raster/muji-aluminum-pen-case-16x9.png) *The MUJI Aluminum Pen Case closed and from above, drawn to scale (1 mm = 1.9 px).* Original drawing (SVG): . Drawings © 2026 Stationery Times, reusable with credit under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). ## Product facts | Product | Brand | Brand origin | Made in | Material | Released | Price range (typical US retail, October 2026) | |---|---|---|---|---|---|---| | MUJI Aluminum Pen Case, flat type (about 62 × 175 × 15 mm) | MUJI (by Ryohin Keikaku Co., Ltd.) | Japan | China | Aluminium alloy body with an alumite (anodised) surface | – | $$: $5–20 per case | - Made in (MUJI Aluminum Pen Case, flat type (about 62 × 175 × 15 mm)): China. MUJI Japan's online store gives 原産国・地域 (country or region of origin) 中国 (China) on the specifications tab for item 82998177. Source: https://www.muji.com/jp/ja/store/cmdty/detail/4550182998177 ## Key takeaways - MUJI Japan gives the outside as about 62 × 175 × 15 mm (2.4 × 6.9 × 0.6 in) and the inside as about 60 × 173 × 13 mm. - A 140 mm MUJI gel ink pen and a 139.5 mm capped LAMY safari fit; an unsharpened 176 mm Staedtler Noris pencil doesn't. - The body is aluminium alloy with an alumite (anodised) finish, per MUJI Japan. - MUJI Japan lists it at ¥690 (about US$4.40); in the US it falls in our $$ band ($5–20). - MUJI Japan gives its country of origin as China; the item number is 82998177. ## What is the MUJI Aluminum Pen Case? **It's a thin, flat aluminium box for carrying a few pens, sold by MUJI in Japan, the US and its other stores.** MUJI USA describes it simply as a slim aluminium pen case for pens and small stationery items. MUJI Japan calls this version the flat type (平型). It has a plain, undecorated metal finish, in line with MUJI's no-brand design, and MUJI Japan also lists a black version. ## MUJI Aluminum Pen Case specs | Spec | MUJI Aluminum Pen Case, flat type | |---|---| | Outside | About 62 × 175 × 15 mm (2.4 × 6.9 × 0.6 in) | | Inside | About 60 × 173 × 13 mm (2.4 × 6.8 × 0.5 in) | | Material | Aluminium alloy, alumite (anodised) surface | | Item number | 82998177 · JAN 4550182998177 | | List price (Japan) | ¥690 (about US$4.40) | | Made in | China | All figures come from the specifications tab of MUJI Japan's product page, which we read on October 21, 2026. MUJI calls its sizes approximate. ![Pens and pencils that fit or don't fit the MUJI Aluminum Pen Case's 173 mm inside, drawn to scale](https://stationerytimes.com/images/muji-aluminum-pen-case-fit.svg) *The inside is about 173 mm long: most pens fit, a new pencil doesn't.* ## Which pens fit in the MUJI aluminum pen case? **Anything up to about 17 cm (6.8 in) long and slim enough to lie side by side in a 13 mm deep tray.** Lengths below come from our guides to each product. | Writing tool | Length | Fits? | |---|---|---| | [MUJI gel ink pen](https://stationerytimes.com/guides/muji-gel-ink-pen/) | 140 mm (5.5 in) | Yes | | [LAMY safari](https://stationerytimes.com/guides/lamy-safari/), capped | 139.5 mm (5.5 in) | Yes | | [Staedtler Noris](https://stationerytimes.com/guides/staedtler-noris/) HB, unsharpened | 176 mm (6.9 in, catalog) | No | | [Ticonderoga #2](https://stationerytimes.com/guides/ticonderoga-2-pencil/), unsharpened | 190 mm (7.5 in) | No | A reviewer on MUJI Japan's store said two fountain pens and a ballpoint filled it. Bulky items may not fit the 13 mm depth: another reviewer there said correction tape doesn't. ## How much does it cost? **In the US the MUJI Aluminum Pen Case falls in our $$ band ($5–20 per case).** MUJI USA's own listing sits in that band. In Japan, MUJI lists it at ¥690 (about US$4.40) including tax. ## Is it durable? **It's sturdy for its weight but can dent: MUJI Japan's care note says not to drop it or give it strong knocks.** Reviews on MUJI's Japanese and US stores mostly praise how light and simple it is. The outside is only about 2 mm longer and wider than the inside, so the walls are thin; we'd treat it as a light everyday case rather than protection for valuable fountain pens in a heavy bag. ## Aluminium or polypropylene: which MUJI pen case? **Choose the aluminium case for a slim metal box and the large polypropylene case if you carry full-length pencils.** MUJI Japan lists both as made in China. | | Aluminum Pen Case | Polypropylene Pen Case, large | |---|---|---| | Outside | About 62 × 175 × 15 mm | About 64 × 184 × 25 mm | | Inside | About 60 × 173 × 13 mm | About 60 × 180 × 21 mm | | New 176 mm pencil fits? | No | Yes | | Material | Anodised aluminium alloy | Translucent polypropylene | The polypropylene case's inside is 7 mm longer and 8 mm deeper, per MUJI Japan, and its Japanese listing carried 170 reviews when we checked, against 13 for the aluminium case. MUJI USA sells the polypropylene case in small and large sizes, both in our $ band (under $5). ## How does it compare with other pen cases? **It's thinner and more rigid than fabric pouches, and holds far less.** A pouch such as the [KOKUYO Neo Critz](https://stationerytimes.com/guides/kokuyo-neo-critz/) or the [DELFONICS Quitterie](https://stationerytimes.com/guides/delfonics-quitterie-pen-case/) carries a full kit of pens, erasers and a ruler. Choose the MUJI case for a few favourite pens in a jacket or a slim bag. MUJI also sells polypropylene pen cases in two sizes and a range of nylon pouches; our [best pencil cases roundup](https://stationerytimes.com/guides/best-pencil-cases/) covers bigger options. ## Where is the MUJI Aluminum Pen Case made? **In China.** MUJI Japan's specifications tab gives 中国 (China) as the country of origin. MUJI itself is a Japanese brand run by Ryohin Keikaku. ## Frequently asked questions ### How big is the MUJI aluminum pen case? MUJI Japan lists the outside at about 62 × 175 × 15 mm and the inside at about 60 × 173 × 13 mm. That's roughly 6.9 in long, 2.4 in wide and just over half an inch thick. ### Does a pencil fit in the MUJI aluminum pen case? Not a new one. The inside is about 173 mm long, and a standard unsharpened pencil such as the Staedtler Noris is about 176 mm. A sharpened pencil that has lost a few millimetres will fit. ### How many pens fit in the MUJI aluminum pen case? MUJI doesn't give a number. A reviewer on MUJI Japan's store found two fountain pens and a ballpoint filled it, and US reviewers say it suits one to three pens. ### Is the MUJI pen case real aluminum? Yes. MUJI Japan lists the body as aluminium alloy with an alumite surface treatment, which is an anodised finish. ### Can the MUJI aluminum pen case dent? MUJI Japan's care note says not to drop it or give it strong knocks, because that can damage it. Thin aluminium dents more easily than a plastic case flexes. ### Is the MUJI aluminum pen case made in Japan? No. MUJI Japan lists China as the country of origin. ## Sources - [無印良品 アルミペンケース 平型・約６０×１７５×１５ｍｍ (MUJI Japan, item 82998177: 原産国 中国; アルミニウム合金, アルマイト; 外寸 約62×175×15mm; 内寸 約60×173×13mm; ¥690; care note; reviews; read in full October 21, 2026)](https://www.muji.com/jp/ja/store/cmdty/detail/4550182998177) - [MUJI USA: Aluminum Pen Case (slim aluminium pen case; 13 reviews; read October 21, 2026)](https://www.muji.us/products/aluminum-pen-case-ncca0a) - [MUJI Japan: ペンケース・ペントレー (pen case range)](https://www.muji.com/jp/ja/store/cmdty/section/S107013801) - [無印良品 ポリプロピレンペンケース 横型・大 (MUJI Japan: 外寸 約184×64×25mm, 内寸 約180×60×21mm, 原産国 中国, 170 reviews)](https://www.muji.com/jp/ja/store/cmdty/detail/4550344907511) - [MUJI USA: Polypropylene Pen Case (small and large)](https://www.muji.us/products/polypropylene-pen-case-horizontal)