This is a Dyneema pouch. The thickness is DCH150, the same as Hyperlite Mountain Gear's black fabric, making it lightweight but incredibly durable. I purchased it from someone who makes and sells them on a flea market site, and I used it about 5 times on hikes, wearing it on my waist to carry snacks and a mobile phone. While there's the characteristic wrinkling of Dyneema, there are no noticeable scratches or stains. I'm selling it because I have too much similar hiking gear. The size is 17.5 x 9 x 3.5 cm. I will fold it compactly for shipping.