Purchased from the official website in 2018. Please check the images for the size and material. (There may be some discrepancies in size compared to the website. It may be an older model.) I used it once or twice every summer, but I haven't used it in the last two years. The images show the newer type with a wide shoulder strap, but this model at the time of purchase did not have a wide shoulder strap. I don't think there are any noticeable stains, but the metal fittings for attaching the shoulder strap have some blackening. See image 8, but it's difficult to see. It was one of my favorites, but I don't think I'll use it anymore, so I'm putting it up for sale. Instant purchase is OK. Please understand and agree to the above before purchasing.