--- title: "MUJI Polypropylene Pen Case: Small & Large Sizes" canonical: "https://stationerytimes.com/guides/muji-polypropylene-pen-case/" description: "MUJI Polypropylene Pen Case explained: small 17.0 × 5.1 × 2.0 cm and large 18.4 × 6.4 × 2.5 cm translucent cases, which pencils fit, price band and origin." category: "Cases" type: "Pen case" published: 2026-11-01 updated: 2026-11-01 author: "Ellis Penhale" publisher: "Stationery Times" sources: 3 products: - name: "MUJI Polypropylene Pen Case, small and large" brand: "MUJI" brand_origin: "Japan" made_in: "China" material: "Polypropylene (per MUJI USA)" price_band: "$ (under $5 per case, typical US retail, October 2026)" manufacturer: "Ryohin Keikaku Co., Ltd." model: "Polypropylene Pen Case (small, large)" gtin: "4550344907504" url: "https://www.muji.us/products/polypropylene-pen-case-horizontal" --- # MUJI Polypropylene Pen Case: Small & Large Sizes > The MUJI Polypropylene Pen Case is a translucent plastic box for pens and pencils. MUJI USA sells a small (17.0 × 5.1 × 2.0 cm) and a large (18.4 × 6.4 × 2.5 cm), both made in China. MUJI Japan lists the large case's inside at 18 cm, long enough for a new pencil. - URL: https://stationerytimes.com/guides/muji-polypropylene-pen-case/ - Category: Cases - Author: Ellis Penhale - Published: 2026-11-01 - Updated: 2026-11-01 ![MUJI small and large translucent polypropylene pen cases seen from above, drawn to scale, each holding pens](https://stationerytimes.com/images/raster/muji-polypropylene-pen-case-illustration-16x9.png?v=91d4879c) *The small and large cases from above, to scale (1 mm = 2 px); the pens inside are drawn by eye.* 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 Polypropylene Pen Case, small and large | MUJI (by Ryohin Keikaku Co., Ltd.) | Japan | China | Polypropylene (per MUJI USA) | – | $: under $5 per case | - Made in (MUJI Polypropylene Pen Case, small and large): China. MUJI USA gives "Country/Region of Origin: China", and MUJI Japan's online store gives China for the large (横型・大) case. Source: https://www.muji.us/products/polypropylene-pen-case-horizontal ## Key takeaways - MUJI USA lists the small at 17.0 × 5.1 × 2.0 cm (6.7 × 2.0 × 0.8 in) and the large at 18.4 × 6.4 × 2.5 cm (7.2 × 2.5 × 1.0 in), outside. - MUJI Japan gives the large case's inside as about 18 cm long, 6 cm wide and 2.1 cm deep, so a 17.6 cm Staedtler Noris pencil fits. - The case is translucent polypropylene, so you can see what's inside. - MUJI USA and MUJI Japan both list China as the country of origin. - Both sizes are in our $ band (under $5), and MUJI USA sells them as Final Sale. ## What is the MUJI Polypropylene Pen Case? **It's a lightweight, translucent plastic box for carrying pens, pencils and markers, sold in a small and a large size.** MUJI USA describes it as durable and lightweight, with a sleek translucent design so you can see what's inside. MUJI is the brand of Ryohin Keikaku, the Japanese retailer. MUJI Japan calls this the horizontal type (横型). ## MUJI polypropylene pen case specs | Spec | Small | Large | |---|---|---| | Outside (MUJI USA) | 17.0 × 5.1 × 2.0 cm (6.7 × 2.0 × 0.8 in) | 18.4 × 6.4 × 2.5 cm (7.2 × 2.5 × 1.0 in) | | Inside (MUJI Japan) | Not listed | About 18 × 6 × 2.1 cm (7.1 × 2.4 × 0.8 in) | | Material | Polypropylene | Polypropylene | | Barcode | 4550344907504 | 4550344907511 | | Made in | China | China | MUJI Japan's inside figure for the large case comes from the page we read on October 21, 2026, and MUJI calls its sizes approximate. We found no weight. ## Who is the MUJI polypropylene pen case for? **It suits anyone who wants a cheap, see-through case that fits a desk or a bag.** The large case's roughly 18 cm inside holds a new pencil, and you can spot what's inside without opening it. Skip it if you need padding or a zip: MUJI's listings don't mention either. ![Pen and pencil lengths drawn to scale against the 180 mm inside of the MUJI large polypropylene pen case](https://stationerytimes.com/images/muji-polypropylene-pen-case-fit.svg?v=15517163) *The large case's inside is about 180 mm long: a new Noris fits, a new Ticonderoga doesn't. Original illustration made for this guide. © Stationery Times.* ## Which pens fit in the MUJI polypropylene pen case? **In the large case, anything up to about 18 cm, including a new pencil.** Lengths come from our guides to each product. | Writing tool | Length | Fits the large case's 180 mm inside? | |---|---|---| | [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) | Yes | | [Ticonderoga #2](https://stationerytimes.com/guides/ticonderoga-2-pencil/), unsharpened | 190 mm (7.5 in) | No | MUJI Japan doesn't list the small case's inside, but its outside is 17.0 cm long, so a 17.6 cm pencil won't fit it. ## Polypropylene or aluminum: which MUJI pen case? **Choose polypropylene for longer items and a lower cost, and the [aluminum case](https://stationerytimes.com/guides/muji-aluminum-pen-case/) for a rigid metal box.** The aluminum case is about 62 × 175 × 15 mm outside and 173 mm long inside, so a new 176 mm pencil doesn't fit it, while the large polypropylene case's 180 mm inside does take one. Our [best pencil cases](https://stationerytimes.com/guides/best-pencil-cases/) roundup covers zipped pouches with more room. ## How much does the MUJI polypropylene pen case cost? **Both sizes are in our $ band, under $5.** MUJI USA lists the large at a higher price than the small. Prices were read on November 1, 2026. ## Where is the MUJI polypropylene pen case made? **In China: both MUJI USA and MUJI Japan give China as the country or region of origin.** MUJI is a Japanese brand. ## Frequently asked questions ### How big is the MUJI polypropylene pen case? MUJI USA lists the small at 17.0 × 5.1 × 2.0 cm and the large at 18.4 × 6.4 × 2.5 cm, outside. That is about 6.7 × 2.0 × 0.8 in and 7.2 × 2.5 × 1.0 in. ### Does a new pencil fit in the MUJI plastic pen case? In the large, yes: MUJI Japan lists its inside as about 18 cm long, and a new Staedtler Noris is about 17.6 cm. A new 19 cm Ticonderoga won't fit. MUJI doesn't give the small case's inside, so we can't say. ### Is the MUJI pen case see-through? It's translucent: MUJI USA says you can instantly see what's inside, though it isn't fully clear. ### How many pens fit in the MUJI polypropylene case? MUJI doesn't give a number. The large's inside is about 6 cm wide and 2.1 cm deep, which is room for a handful of slim pens laid side by side. ### Is the MUJI polypropylene pen case made in Japan? No. MUJI USA and MUJI Japan both list China as the country of origin. ### Is the polypropylene case better than MUJI's aluminum one? It holds a longer item: its inside is about 7 mm longer and 8 mm deeper than the aluminium case. The aluminium case is rigid metal and costs more. ### Can I return a MUJI pen case bought online? MUJI USA marks it Final Sale, with no refunds or exchanges, on its product page as we read it. ## Sources - [MUJI USA: Polypropylene Pen Case (small 17.0 × 5.1 × 2.0 cm, large 18.4 × 6.4 × 2.5 cm; polypropylene; China; read in full November 1, 2026)](https://www.muji.us/products/polypropylene-pen-case-horizontal) - [無印良品 ポリプロピレンペンケース 横型・大 (MUJI Japan, as read for our Aluminum Pen Case guide on October 21, 2026: 外寸 約184×64×25mm, 内寸 約180×60×21mm, 原産国 中国)](https://www.muji.com/jp/ja/store/cmdty/detail/4550344907511) - [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)