I purchased this item used and have only used it once. (I tested it recently at home and slept on it, and the next morning it was still perfectly firm with no air leaks.) The previous owner also used it infrequently, and only used an air pump to inflate it, so I believe the inside is clean. *I have listed the current selling price on Amazon as a reference. It packs down small, so I bought it for solo backpacking, but I won't be able to use it for a while due to childcare, so I'm selling it. It's about 8-10 cm thick. Great for camping and car camping. I used it in mid-winter and didn't feel any cold from the ground. - Brand: SEA TO SUMMIT - Material: Polyurethane foam - Color: Olive Green - Storage size: Compact storage possible Military tent Camping Mountaineering Bushcraft Thank you for viewing. *Simple packaging (cardboard box)