A3 is NOT Legal Size - This Moleskine Sketchbook is Gigantic

Marjolein Delhaas - Journal 365 - Flame – VOLTA

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Notebook A4 Large, Handmade Berlin, Black Hardcover Sketchbook Blank, Also With Logo

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What is the best size for sketchbooks when you are drawing outside of your home, on the streets and in nature? - Quora

Paper and Notebook Sizes Explained

Notebooks, A4 & A5 books

MOLESKINE ART COLLECTION: From sketchbooks and sketchpads to watercolor notebooks with heavy paper, to music notebooks with plain and pentagram pages,

Moleskine Art Watercolor Notebook, Hard Cover, A3 (11.75 x 16.5) Plain/Blank, Black, 60 Pages

Rite in the Rain Official Site