Common shells include recycled cotton, heavy cotton duck canvas (for example, 18 oz #8), synthetic polyurethane, and polyester variants such as rugged 900D polyester.
Weather protection depends on the model. Listings describe finishes such as water-repellent and water-resistant fabrics, fully waterproof constructions on some structured travel duffels, and occasional wind-resistant treatments. Check the specific listing for the exact protective rating.
Many listings include dedicated shoe pockets or independent (sometimes ventilated) shoe compartments and separate toiletry bags. A few models also advertise a wet pocket for storing damp items.
Capacity and rated load vary by model. Reported "holds up to" weights in listings range from about 15 pounds for the smallest lightweight bags up to 122 pounds for larger canvas duffels. Some rolling duffels list volume rather than weight (one listing shows a 120‑liter capacity). Check the specific product listing for its weight rating or volume.
Most listings recommend spot clean or wipe clean. A few lighter-weight options specify hand wash. Follow the care instructions in the individual product listing to protect the material and any water‑repellent finishes.