Difference between a gym bag and a duffel bag is mainly in the style of each. Gym bags are typically small to medium sized, rectangular shaped bags that usually feature an adjustable shoulder strap and two handles for carrying. They’re often made from lightweight materials like nylon or polyester, with convenient pockets on the outside for storing items like your keys and phone. Duffel bags come in various sizes, but they tend to be larger than gym bags with more internal space available for packing clothes, shoes, and other gear. While most duffels don’t have exterior pockets like gym bags do, they often feature several compartments inside so you can organize your belongings better while still being able to fit everything into one large bag. Additionally, duffels typically come with padded straps as well as handles which make them more comfortable to carry over long distances when compared to smaller gym bags without straps or padding.