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.
On this page
Product facts
- Product
- MUJI Polypropylene Pen Case, small and large
- Brand
- MUJI
- Brand origin
- Japan
- Made in
- China*
- Material
- Polypropylene (per MUJI USA)
- Price range
- $under $5 per case
- Rate it
Notes on these facts
- Made by Ryohin Keikaku Co., Ltd.. Made in 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. Price: example listing.
- How we test and disclose samples: How we test stationery.
- Price bands are typical US retail, checked October 2026.
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.
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 | 140 mm (5.5 in) | Yes |
| LAMY safari, capped | 139.5 mm (5.5 in) | Yes |
| Staedtler Noris HB, unsharpened | 176 mm (6.9 in) | Yes |
| Ticonderoga #2, 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 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 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)
- 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)
- MUJI Japan: ペンケース・ペントレー (pen case range)