JusArt
JusArt Water Brush Pens (6-Pack)
Best for: Urban sketchers and water-soluble pencil users who paint on the go

Fuumuui
A square 7.6 x 7.6 inch watercolor sketchbook with 30 sheets of 140 lb (300gsm) cold pressed cotton paper. The micro-perforated pages open flat.
Best for: Travel painters and daily watercolor journalers who want a small book
The Fuumuui Watercolor Journal is a square 7.6 x 7.6 inch sketchbook with 30 sheets of 140 lb (300gsm) cold pressed cotton paper. It opens completely flat, so you can paint across a full page without fighting the binding.
Each sheet is micro-perforated. You can keep your paintings together as a journal or tear out a finished page cleanly to frame or store it. The listing says the paper is acid-free and works with watercolor, gouache, acrylics, inks and dry media.
Based on the manufacturer's Amazon listing.
The listing says a cylinder mold process spreads the cotton fibers evenly, so the surface resists scratching and erasing under multiple layers, masking fluid and tape, and slackens evenly when wet.
A lightly textured surface, the usual choice for watercolor washes.
The book opens completely, so you can paint right into the gutter or across a spread.
Pages turn easily and tear out without damaging the painting, so you can frame a finished piece.
The listing says the paper resists yellowing, so work kept in the journal stays bright under normal storage.
At 7.6 x 7.6 inches it fits in a bag for outdoor painting, travel and quick daily studies.
Look elsewhere if: you want bigger sheets. The Canson XL Watercolor Pad is 9 x 12 inches with 30 sheets.
Fuumuui Watercolor Journal 7.6 x 7.6
Choose it for: Cotton paper in a travel book
Choose it for: Larger 9 x 12 inch sheets
Arches Hot Press Watercolor Pad
Choose it for: Smooth cotton paper
JusArt
Best for: Urban sketchers and water-soluble pencil users who paint on the go
ABEIER
Best for: Beginners and students trying gouache on watercolor paper or canvas
DOODLE HOG
Best for: Beginners, letterers and illustrators who blend with water brushes
Soucolor
Best for: Painters of all levels working in watercolor, acrylic or mixed media