Planner systems
Hobonichi Original vs Cousin vs Weeks
Compare Hobonichi Original, Cousin, and Weeks by page format, dimensions, weight, portability, language, and the jobs each planner is built to handle.
Open field guideJapanese stationery, mapped
Find the notebook that actually fits.
A source-checked field guide to Japanese paper sizes, planner formats, and refill systems—made for US shoppers who would rather measure once than return twice.
A fit-first approach
“A5” is a size.
It is not a promise.
A5
A6
Weeks
Passport
A notebook can share the same page footprint as another and still miss the cover, rings, or refill band that you expected it to use.
Bungu Atlas keeps three questions separate: How big is it? Which system is it made for? and Can a US shopper currently get it? That separation turns vague product labels into a practical buying decision.
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Size notes
Japanese Notebook Size Chart in Inches and Millimeters
A practical conversion chart for A7, A6, A5, B6 Slim, Hobonichi Weeks, TRAVELER’S Regular and Passport, MD Notebook, and Kokuyo binder formats.
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Refill systems
TRAVELER’S Notebook Regular Refill Guide
A current category-by-category guide to Regular size writing, diary, storage, connecting, repair, and archive refills using official product numbers.
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US buying
How to Buy Japanese Notebooks from the US
A source-first buying workflow for official US stores, authorized retailers, imports, marketplace listings, returns, and counterfeit risk.
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Planner systems
Hobonichi Planner Formats and Language Options
Original, Planner, Cousin, HON, Weeks, Day-Free, and 5-Year compared by layout, language, size, and date structure.
Open field guide
Refill systems
Hobonichi Size and Cover Compatibility
A conservative compatibility map for Original, Planner, Avec, Cousin, Day-Free, HON, Weeks, and 5-Year Techo formats.
Open field guideInteractive atlas
Put two formats on the same grid.
Compare width, height, and system notes for Hobonichi, TRAVELER’S notebook, Kokuyo Campus, MD Notebook, and standard A sizes.
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Dated planners
Hobonichi
A research index for Hobonichi Techo formats, language editions, book dimensions, and cover families.
Refill systems
TRAVELER'S COMPANY
Regular and Passport refill dimensions, official system boundaries, and US availability notes.
Notebooks and binders
Kokuyo Campus
A field guide to Campus paper formats, binder variants, and hole-count traps.
Book-inspired notebooks
MD PAPER PRODUCTS
A size and ruling index for MD Notebook formats, from A6 through B6 Slim and A5.