This Leather World Bags is a Duffel but it also becomes a Backpack and it’s made of polyester material. It has a spacious compartment to store all your gymming valuables from gloves to shoes. It also has a shoe compartment that lets you carry your shoes before you grind. The shoulder strap is easily detachable if you want to carry it as a backpack. So, no excuses, go gymming, stay healthy. This bag has a special feature and that is its Convertible design. You could easily convert this bag to a backpack, shoulder bag, and Quick Grab Handle for easy hauling around. Also, the back strap can be concealed in the back compartment.