Briggs & Riley Exchange Medium Duffle, Black, One Size Strategic use of lightweight, durable 420D nylon, 600D polyester and water-resistant tarpaulin; contrasting gray heather fabric for modern aesthetic Zipper YKK RC zipper hardware for smooth, self-repairing zipper action; ergonomic, lockable double zipper pulls.Outer fabrics resist wear, moisture, dirt and abrasion Durable webbing top carry handle for comfortable carrying Duffle easily converts to backpack via zip-away back panel; folded down panel provides comfort and lumbar support Aerated mesh back padding allows air to circulate against body, keeping back cool