Wa-shi letter set -KOI BUMI- Paulownia box

  • 1710TSU5K
  • 1710TSU5K
  • 1710TSU5K
  • 1710TSU5K
  • 1710TSU5K
  • 1710TSU5K
  • 1710TSU5K

Traditional Crafts Letter Set  Koibumi – thousand year love –

It is a product for proposing to help you communicate your feelings through historical traditional crafts, enrich your mind.


This is a paulownia box you can use for envelope replacement and storage.

You can write the address with a felt pen or the like, or keep the written letter as roll.


恋文シリーズ 桐封箱



It is a collaboration product of local industry called “Washi” and “paulownia box” traditional crafts in Saitama Prefecture.

It is a box that can be used for wooden envelopes and storage that recognizes Japan’s prideful history and culture and feels the beauty of Japanese.



About material


Paulownia box of Kasukabe

Kasukabe city of Saitama prefecture is called the nikko station of Nikko Highway and has a flourishing history. The art of the craft that handled NIKKO TOSHOGU SHRINE at that time is still inherited.

One of the traditional crafts of the Kasukabe is “paulownia box”




Depending on the skill and specification of the craftsmen, the paulownia box prevents oxidation and deterioration of things put in it, it is an excellent storage box for moistureproof and insect repellent.

Also, you can enjoy the wooden materials gradually becoming their own colors gradually with the aging.

When you send out a pleasant letter, you will receive a letter of reply in many cases. It is a lid of a seal cage type that keeps the best stored condition so that you can leave such a letter you want to keep for a long time.

The seal cage type is adjusted to the thickness of one sheet so that the lid closes tightly, and you can feel the feeling of polite making at opening and closing.

Japanese Washi paper and sumi-ink are outstanding compatibility.

A letter of Japanese paper written with a brushed pen is carefully protected for 1000 years by a seal-type paulownia box.

When you write your name in this paulownia box, I recommend a felt pen.

Writing with a pen brush makes characters difficult to read.



The  story of product development


We opened a shop in Bonsai town in Saitama prefecture, which is famous worldwide as a sacred place of BONSAI in April 2014.


和雑貨・手づくり雑貨とワークショップ つくりえ 2015年オープン


As a place for people to gather in common fun (handmade), we operated the workshop space and provided sales opportunities (box shop).

Six months after opening, the store got burned down, the shop closed due to the grueling fire.

At that time, many customers and stakeholders sent encouraging handwritten letters to us.




Until then, I used Internet tools only, except New Year’s cards. For us who were depressed feeling, the handwritten letters gave me a very wonderful courage.

I realized that anyone could write a letter from children to adults. We can easily mail you. Moreover, feelings are transmitted without misunderstanding. We found the letter is the best handmade tool.


We embarked on product development that the letter was perfect as a tool to convey “warmth of handmade” which is also our concept, I came to the material called Ogawa ‘s Washi and Kasukabe’ s paulownia box.


I thought that we could share the work process, the background of the industry, feelings etc if we could actually see the craftsman. (Most of us are actually able to meet craftsmen with whom we associate.)


I want to write a reply when I get a letter. Writing a reply will be an interactive two-way interaction. Among them, I want to write letters to other people. I believe that opportunities to send letters will increase, more people will receive it, and will spend more time warming people’s feelings as time goes slowly to paper.




Japan has a beautiful culture. We value the feeling of the season and choose the item of color, material and quality that fits the situation.


This product is suitable for certain occasions, such as thank-you notes to important customers, letters to my beloved family, and serious feelings for my future self. I hope you find it useful.


About Koibumi Paulownia box


恋文シリーズ 桐封箱


This paulownia box protects the washi paper put in it and its letters for 1000 years with it being readable.


Product content

Approximate weight 65g
Package size (length × width × height) 23.5 × 5.0 × 4.3 cm
Paulownia box Fine sealability


Please use together with Hosokawa paper certified as UNESCO intangible cultural heritage.
It can leave it carefully for 100 years.



(“Koibumi” is a registered trademark of Tsukurie.  Trademark registration No. 5922942)

Retail Price(Including Tax)
Stock Status
In Stock