Duffel bags are excellent for air travel if you prioritize flexibility and weight, but they have drawbacks compared to hardshell suitcases. A high-quality "travel duffel" (like those from Patagonia or North Face) is made of durable, water-resistant material and can be "squished" into tight overhead bins or odd-shaped trunks, making them ideal for small aircraft or regional trains. They are also significantly lighter than wheeled suitcases, allowing you to pack more gear before hitting the airline's weight limit. However, the lack of a rigid frame means they provide zero protection for fragile items; if you are packing souvenirs or electronics, a duffel is a risky choice. Furthermore, carrying a heavy duffel over one shoulder can be physically taxing in large airports. For 2026 travel, many people prefer "hybrid" duffels that include tuck-away backpack straps and small wheels, offering the best of both worlds: the versatility of a soft bag with the ease of a traditional suitcase.