Rothco Thin Blue Line Canvas Shoulder Duffle Bag. The 19" x 9" duffle bag is made of a heavyweight cotton canvas with a detachable and adjustable shoulder strap as well as twin carry-on handles. On one side of the canvas shoulder back is an embroidered Thin Blue Line US Flag. There is also a zippered pocket at the end of the bag.' Specifications for Rothco Thin Blue Line Canvas Shoulder Duffle Bag: Manufacturer: Rothco Color: Black Fabric/Material: Heavyweight Cotton Canvas Features of Rothco Thin Blue Line Canvas Shoulder Duffle Bag Material: Cotton Canvas Material Specs: 100percent Heavyweight Cotton Canvas Package Contents: Rothco Thin Blue Line Canvas Shoulder Duffle Bag Rothco Thin Blue Line Canvas Shoulder Duffle Bag 2230