This is official merchandise from T.M.Revolution's live concert "T.M.R LIVE REVOLUTION '99 -THE FORCE-". I purchased it through mail order back then and have kept it unopened. There appears to be no noticeable stains through the bag, but I haven't checked in detail. The size is unknown, but if I could have chosen a size, I probably would have chosen M. I found the following information, so I'll excerpt it. (However, it's unclear if there was only one size) ↓ 【Product Details】 Size: Length approx. 67cm, Width approx. 48cm Color: Black Material: 100% Cotton Thank you for your understanding.