Arena waterproof pouch. Usage history unknown. I think it's unused or used a few times. It looks clean without any stains or damage, so I think it can still be used. Please refrain from purchasing if you are looking for a perfect item. Approximately 13 cm long x 28 cm wide x 5 cm top gusset x 9 cm bottom gusset. It uses a material with excellent waterproof and water-repellent properties. It's useful for organizing wet swimsuits, rain gear, and small items you don't want to get wet. It's lightweight and compact, making it convenient to carry. It's useful not only for pools but also for travel and outdoor activities in various situations.