A hybrid duffle, also known as a duffel backpack, is a duffel bag that features dual function straps that allow you to wear it as a backpack. These straps allow you to have all the amazing features of a duffel bag and the convenience of a backpack. However, a hybrid duffel is not as comfortable as a dedicated travel backpack. Since they lack structure, duffle backpacks will likely slouch against your back which may cause discomfort when worn for long periods.