Designed to fit mats of any size, the Commuter mat carrier is an eco-friendly alternative that keeps your yoga mat easily accessible and at your side for all occasions. Cotton twill and webbing are natural, renewable materials. They are unbleached and free of AZO dyes which reduces the amount of chemicals & toxins released into the environment. Cotton twill and webbing are natural, renewable materials. They are unbleached and free of AZO dyes which reduces the amount of chemicals & toxins released into the environment.