MZ Wallace Travel Jim Duffle Bag Navy

Received as a gift - only used a few times (the wrapper is still on some zippers), but I cannot find the long strap. Features from the website: Zip top closure Reinforced, padded nylon handles Additional straps: Exterior pockets: 3 Protective feet: Natural leather Luggage sleeve Fits a laptop up to 15 in Interior pockets: 6 Black interior lining Detachable pouches: 1 Phone pocket Key ring strap