Summit Trail Duffel - Large Blue Moon. Weâ??re constantly testing our products in the worst conditions all around the world to make our products perform even better. Explore how we test, and share your toughest moments of testing here. The Summit Trail Duffels come in a range of sizes: Small 64.1L (3915 cubic inch); Medium 121.3L (7404 cubic inch); Large 226.1L (13799 cubic inch). Patented Omni-Shield delivers protection from outdoors where you least expect it but need it most. This coated fabric helps you stay clean and dry by resisting the absorption of liquids into the yarns to prevent staining the material. The fabric also dries 3-5 times faster than untreated fabric, without holding moisture like a conventional fabric, meaning it stays lighter even when it's wet.