As opposed to a traditional suitcase, soft-sided luggage tends to be much more lightweight and forgiving when it comes to how much you can fit into one bag. Most rolling duffel bags also come with lots of exterior compartments that make it easier to keep things organized and easily accessible. Unlike traditional duffel bags, however, you'll enjoy the ease of rollable wheels instead of having to lug around a heavy bag using a crossbody strap or backpack straps.