I used this once in the spring of last year, and it's been stored in the storage room ever since. I'm selling it because I don't have any camping plans in the future. It was secured with the top lid of the backpack, so it's slightly arched. OPP packaging. I will measure the size and weight when packing to determine the shipping method. Type: Silver mat/urethane mat Features: Waterproof Thickness: ~2cm