The primary advantages of a duffel bag are its flexibility, durability, and superior storage-to-weight ratio. Unlike hardshell suitcases, duffel bags are "soft-sided," meaning they can be compressed to fit into tight spaces like crowded overhead bins, small trunks, or under-bed storage in hotels. Their simple, cylindrical or rectangular shape allows you to pack bulky or oddly shaped items—such as sports equipment, boots, or laundry—that might not fit in structured luggage. Duffels are also typically much lighter than wheeled bags because they lack internal frames and heavy wheel assemblies, which is a significant benefit when trying to stay under strict airline weight limits. For adventure travelers, many modern duffels come with "tuck-away" backpack straps, offering the carrying ease of a rucksack with the easy access of a suitcase. Furthermore, because they are often made of rugged materials like ballistic nylon or tarpaulin, they are highly resistant to the rough handling typical of baggage carousels and outdoor expeditions.