Chasm 40L Black Duffle BagDescription Thule Chasm 40L duffel bag is a rugged, weather resistant bag that can be converted into a backpack with shoulder straps that tuck away after use. The internal mesh pockets help you organize your things while the wide mouth opening makes it easy to pack all your gear. This sturdy duffel is made with weather resistant tarpaulin fabric and a padded bottom to protect your items on wild adventures or weekend trips.