Midori Mogumogu Letter: Mini Letter Set With Stickers

Midori Mogumogu Letter to scale: a 90 × 110 mm lined sheet, a pink envelope sealed by a cat sticker, and a sticker sheet — Sheet, envelope and stickers of the cat set, at 1 mm = 1.5 px.

Product facts

Product: Midori Mogumogu Letter mini letter set, cat (86933006)
Brand: Midori
Brand origin: Japan
Made in: Not stated^*
Material: Paper letter sheets and envelopes; paper sticker sheet
Price range: $$$5–20 per ream or pad
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Notes on these facts

Made by Designphil Inc. (Tokyo). Country of manufacture not stated: Midori's online store pages for the Mogumogu Letter and the JetPens listing we read on October 23, 2026 don't state a country of manufacture. Price: example listing.
Price bands are typical US retail, checked October 2026. Conversions to US dollars are approximate, at October 2026 rates (US$1 = ¥158 = ₩1,330 = NT$32.5 = CN¥6.7 = SEK 9.9 = DKK 6.7 = ₺49.6 = C$1.41 = A$1.43 = CZK 21.7; €1 = US$1.12; £1 = US$1.32; CHF 1 = US$1.21).

Key takeaways

Each Mogumogu Letter set holds 6 letter sheets, 3 envelopes and 1 sheet of stickers, at ¥418 (about US$2.60) on Midori's store.
Midori lists the sheets at 110 × 90 mm (4.3 × 3.5 in) and the envelopes at 63 × 96 mm (2.5 × 3.8 in); JetPens counts 9 lines at 9 mm spacing.
There are 4 versions, each sealed by a different animal: cat, rabbit, hamster and dog.
Midori marks the envelopes as not for mailing: they are for hand-delivered notes and gifts.
Japanese shop staff named it the letter winner of the Bungu-ya-san Taishō 2026.

What is the Midori Mogumogu Letter?

It is a mini letter set you seal with stickers of animals and food in funny poses. Mogumogu (もぐもぐ) is the Japanese sound of chewing with a full mouth.

Midori, the Designphil stationery brand, pitches it as a small communication item that makes both the writer and the reader smile. It suits a thank-you with a souvenir, a note on a gift or a message left on a desk.

Japanese shop staff named it the letter winner (レター賞) of the Bungu-ya-san Taishō 2026.

Mogumogu Letter specs

Spec	Value
Maker	Midori (Designphil Inc., Tokyo)
Contents	6 letter sheets, 3 envelopes, 1 sticker sheet
Letter sheet	110 × 90 mm (4.3 × 3.5 in), lined
Lines	9, at 9 mm spacing (JetPens)
Envelope	63 × 96 mm (2.5 × 3.8 in), not for mailing
Package	131 × 115 × 5 mm
Versions	Cat, rabbit, hamster, dog
Price	¥418 (about US$2.60) with tax

Sizes, contents and price are from Midori’s online store; the line count is from JetPens.

Midori Mogumogu Letter contents to scale: package, 90 × 110 mm sheet, 96 × 63 mm envelope and the sheet folded once — Package, sheet, envelope and the folded sheet, at 1 mm = 1.4 px.

How do the stickers work?

You seal the envelope flap with one of the stickers and use the rest to decorate the letter. Midori describes them as animals and foods in unique poses, meant to make the reader smile.

Each version is named for its animal: “seal with a cat”, “seal with a rabbit”, “seal with a hamster” and “seal with a dog”. The envelopes are small, so the sheet folds once to fit.

How does it compare with a full-size letter pad?

It is for short notes, not long letters: each sheet has about a quarter of the area of an MD Letter Pad sheet.

	Mogumogu Letter	Midori MD Letter Pad
Sheet size	110 × 90 mm	210 × 168 mm
Sheets	6, with 3 envelopes	50, envelopes sold apart
Paper	Not named by Midori	Cream MD Paper
Use	Gift notes, hand delivery	Letters you mail

The MD Letter Pad figures come from its guide. For decorating a longer letter, Midori’s Yuru Log stickers add small illustrations in the same spirit.

Which animal should you choose?

All four sets have the same contents and sizes; only the animal on the stickers and the design change. Midori names each set after the animal that seals it.

Set	Japanese name	Midori code
Cat	ネコで封するもぐもぐレター	86933006
Rabbit	ウサギで封するもぐもぐレター	86934006
Hamster	ハムスターで封するもぐもぐレター	86935006
Dog	イヌで封するもぐもぐレター	86936006

JetPens sells the cat set as “Hungry Cat”, with a pink envelope. Buying two animals gives you 12 sheets and 6 envelopes, enough for a class or a team.

What is it good for?

Short notes you hand over: a thank-you with a souvenir, a message on a gift, or a note left on a colleague’s desk. Midori lists those uses itself, and the envelopes are marked as not for mailing.

The small sheet suits two or three sentences in a fine pen. For anything longer, or for a letter you post, a full-size pad and standard envelopes are the better choice.

Can you buy it in the US?

Yes, as an import: JetPens listed the cat set in stock on October 23, 2026, in our $$ band ($5–20).

In Japan, Midori’s store sells all four at ¥418 (about US$2.60) each.

Where is the Mogumogu Letter made?

Midori doesn’t say on its store pages, and JetPens doesn’t list it either. We list it as not stated until we can check a package.

Frequently asked questions

What does mogumogu mean?

It is the Japanese sound for munching or chewing with your mouth full, which fits the set's animal and food stickers used to seal the envelope.

Can you mail a Mogumogu Letter envelope?

No. Midori marks the envelopes 郵送不可, not for mailing. Use them for notes handed over in person or tucked into a gift.

Which animals does the Mogumogu Letter come in?

Four sets: cat (86933006), rabbit (86934006), hamster (86935006) and dog (86936006), per Midori's online store.

How do the letter sheets fit the envelope?

The 90 × 110 mm sheet folds once to 90 × 55 mm, which fits the 96 × 63 mm envelope.

Is the Mogumogu Letter sold in the US?

Yes, as an import: JetPens listed the cat set (Hungry Cat) in stock on October 23, 2026.

What paper is the Mogumogu Letter printed on?

Midori doesn't name the paper or its weight on the store page. JetPens lists white lined sheets with 9 lines.

Sources (6)

Plain-text version for AI agents: midori-mogumogu-letter.md · Spotted an error? See how we check facts.