car carrying case

Listings commonly show capacities from about 15 to 21 cubic feet (examples cited: 15 cu ft, 20 cu ft, 21 cu ft). These sizes are usually enough to hold multiple suitcases, tents, or luggage for several people.

They generally mount using door hooks, reinforced straps, and an anti-slip/grip mat so many models can be installed with or without roof rails. Listings say the attachment systems fit sedans, SUVs, trucks and many other cars, though some sliding-door vehicles are excluded.

Common included accessories are an anti-slip/non-slip mat, multiple door hooks, reinforced straps, and a storage bag. Some listings also include a combination or luggage lock and highlight waterproof zippers and reinforced seams.

Several listings emphasize quick setup, stating the carrier can be installed in under a minute or within a few minutes using the included hooks and straps. Actual installation time will vary by model and user experience.

Based on review summaries, many users report that the bags have thick, waterproof construction and remain stable at highway speeds, holding up well on long, wet drives. Durability and weather resistance are commonly noted, though performance may vary by model and driving conditions.

Item (product) weights in the listings range from about 0.5 pounds up to roughly 11.2 pounds. At least one rooftop bag listing specifies a cargo limit of 'Holds up to: 100 pounds.' Cargo capacity varies by model—check the specific product listing for its rated load limit.