Fuxi
Fuxi 9x12 Spiral Sketchbook
Best for: Students and daily sketchers practicing with pencil and charcoal

Prudiut
A small square 5 x 5 inch hardcover sketchbook with 80 sheets of 160 gsm (98 lb) acid-free paper, an elastic band and a ribbon bookmark.
Best for: Sketchers who want a thick-paper book that fits in a bag or pocket
The Prudiut 5x5 Hardcover Sketchbook is a small square book with 80 sheets of 160 gsm (98 lb) acid-free paper. It has a sturdy hard cover, an elastic closure band and a ribbon bookmark, and comes gift-packaged in emerald green.
Prudiut says the heavy paper resists bleed-through and yellowing and suits pencils, ink pens, markers and crayons. At 5 x 5 inches it fits in a pocket or small bag, sized for quick sketches and travel drawings.
Based on the manufacturer's Amazon listing.
Prudiut calls it heavyweight and says it resists bleed-through and yellowing.
A compact, square format for quick studies, thumbnails and daily sketches.
80 sheets in a 5 x 5 inch book.
A sturdy cover protects your work in a bag and gives you a firm surface to draw on.
The band keeps it closed and, Prudiut notes, can hold a pen or pencil. The ribbon marks your page.
It comes in ready-to-give packaging for birthdays and holidays.
Look elsewhere if: you want bigger pages with even thicker paper. The String & Space 200gsm Hardcover Sketchbook is 5.8 x 8.5 inches.
Prudiut 5x5 Hardcover Sketchbook
Choose it for: Heavy paper in a pocket square
Leda Art Supply Pocket Sketchbook
Choose it for: Stitched binding and a back pocket
String & Space 200gsm Hardcover Sketchbook
Choose it for: Thicker paper, bigger pages
Fuxi
Best for: Students and daily sketchers practicing with pencil and charcoal
Soucolor
Best for: Kids and students who draw every day or need a pad for art homework
Moleskine
Best for: Sketchers who draw in pen or pencil and want a pad that fits a pocket
MOFUNY
Best for: Mixed media artists and art students who work in several wet and dry media