Custom Duffel & Gym Bags, Graphite 18" Duffle Bag - Heathered Material, The Graphite 18" Duffel Bag stays on trend at a great value. This sport duffel is made from heathered material and is the perfect size for overnight stays. The Graphite 18" Duffel Bag includes a permanent adjustable shoulder strap. Perfect size for overnight stays Permanent adjustable shoulder strap Trendy heathered material ... #3450-33 $10.23/each.