Kokuyo’s Field Notebook (Sokuryo Yacho / 測量野帳) was originally engineered in 1959 for civil engineers and construction surveyors who needed a rigid, pocketable hardback they could write on while standing in mud. Decades later, it has become an indispensable pocket companion for field researchers, urban sketchers, and bullet journalers who value durability over fuss.

Starting October 14, 2026, Kokuyo is teaming up with Kamoi Kakoshi’s cult washi tape label mt for an eight-design limited collaboration, pairing the notebook's utilitarian silhouette with purpose-built masking tape accents designed for personal customization.

Two mt and Kokuyo collaborative Field Notebooks featuring a minimalist cityscape design with colorful custom pattern overlays.

Example of before customizing (left) and after customizing (right) the limited-edition mt and Kokuyo collaborative Field Notebook

The collection plays directly into how stationery fans already use washi tape to catalog, tab, and index their field logs. Instead of static cover prints, several designs feature illustrated construction surveyors "working" on scaffolding, city skylines, and ruled baselines, inviting users to tape, layer, and collage their own structural elements into the scene.

Alongside the collaboration, Kokuyo is rolling out an in-house protective clear vinyl sleeve equipped with an integrated lanyard loop, turning the compact hardback into wearable field kit for outdoor notes or event roaming.

The Lineup: Built to Be Modified

Set of eight mt brand masking tapes featuring various colorful geometric patterns and abstract designs on a white background.

mt Collaboration Field Notebooks (¥530 excl. tax / ¥583 incl. tax): Eight limited-edition cover variants featuring clean two-tone color blocks, striped geometric layouts, and graphic architectural surveyor prints ready for tape embellishments.

Assorted rolls of MT masking tape featuring various colorful geometric patterns and stripes arranged diagonally on a white background.

mt Collaboration Washi Tape (¥270 excl. tax / ¥297 incl. tax): Six unique masking tape patterns incorporating miniature surveying crews, classic Yacho grid rulings, layered tapes, and retro notebook logos sized to accent headers and page margins.

A person in a white shirt holding a dark green sketchbook and a white pen.

Surveyor's Notebook Cover with Strap Hole (¥750 excl. tax / ¥825 incl. tax): This item isn't a collaborative item, but Kokuyo's standalone, clear sleeve designed to shield the notebook from weather. The clear cover for your new notebook will feature an integrated eyelet to thread a neck strap or shoulder cord.

The limited-edition collection arrives at Japanese stationery boutiques and lifestyle retailers on October 14, 2026.