I have tried a number of travel, (or pocket, or reversible) brushes over the years and they are wonderful tools to have. Here are some examples.
|The brush heads|
From left in all photos - Isabey squirrel quill
Rosemary & Co Squirrel Quill
Rosemary & Co sable quill
Arches Squirrel Quill #3
Art Spectrum sable #6
Art spectrum sable #2
Escoda sable #2
Escoda sable #4
Escoda sable #6
Rosemary & Co trees
|A range of travel brushes|
|The same brushes closed for travel|
My absolute favourite is the first one, the Isabey squirrel mop - it has a gorgeous fine tip for drawing with and holds enough paint for small sketches. For larger washes or larger work the next two brushes are lovely. The Arches brush comes into its own for larger than A4 work, which I don't often do Plein air. It is stiffer than most squirrel mops so is almost more like a sable. The next 5 sables are all excellent brushes. The Rosemary tree brush is unusual. The final three are synthetics and once again a larger size than I generally use for plein air.
I also use some water brushes when outdoors. They are very convenient if you need to do a quick sketch in an awkward spot too.
2014 update - see more on my website
at the bottom of this page of plein air sketches.