Purchased from Nruc in Tochigi and used three times for mountain climbing. It has a built-in insulator to keep food warm, making it easy to use, but I'm selling it because I don't use it often. I mainly used it to keep alpha rice warm, but the wide gusset allows you to use it for circular items like cup ramen as well. There's a design on the back with a rubber band to hold a spork. As you can see in photos 6, 7, and 8, there are some areas where the surface Tyvek has peeled off and turned white. It's not a tear in the fabric, so it's only noticeable depending on the light, and you might not even see it unless you look closely. - Material - Tyvek Silver (Front), Cordura Rip (Back) [Inner] Climashield 3.6oz - Weight - 27g - Size - W17 × H13 × D2~6 (cm)