Bamboo mats have traditionally been used to roll up paintbrushes for easy storage and transportation, keeping bristles safely upright and protected.
Mrs. Easton showed us on her blog an old modified bamboo roll she came across when reorganizing her craft supplies in preparation for a move.
She wove thin elastic through the bamboo slats in her mat, adding stability to the roll to keep individual brushes in place. Click the link above to see more pics and get a better idea of how she modified it.
Here’s a link to a similar, unmodified bamboo paintbrush roll on Amazon.com.