Sea To Summit’s Pack Rack Inflatable Roof Rack makes a ton of sense to us. For surf & ski trips to foreign lands with tiny rental cars, it’s amazing. For every day around-town use, it’s just as capable. It’s a lightweight, super-portable system that uses webbing straps and inflatable air tubes made of rugged, 420 D TPU-laminated nylon to secure your gear safely to the roof. When you’re done, it packs down to a small stuff sack until the next trip.