This is a set of 4, but one has been opened. It has not been used (compressed), but please refrain from purchasing if you are concerned. Included items: Compression bags x 3 Dedicated adapter Purchase price: 3,990 yen - The dedicated adapter fits perfectly on the valve. - Easy to use even for the first time, with no air return and an auto-valve compression bag that doesn't require locking. - The double zipper, which prevents air leakage, comes with a slider for easy sealing. ■ Speed Mat with Futon Compression Bag Material: Body: Polyethylene, nylon Valve: Polyethylene, polypropylene, polyester, elastomer Slider: Polyacetal Size: Approximately 120 x 90 cm * Due to the nature of the product, slight variations (approximately ±1cm) may occur in the listed size depending on the manufacturing process, materials, and environment. Please understand this in advance. Precautions for use: - Avoid using feather products with less than 80% down and feather products with more than 20% feathers. - Be careful as forcing items that are difficult to fit inside may tear the ends of the zipper or the bag. * Some items may not be usable depending on the mattress, hard cotton futon, or the amount of cotton in the futon. - Do not put oxygen absorbers inside the compression bag. - If the fabric of the stored items is made of special threads (gold thread, silver thread, dyed thread, etc.), it may discolor. Storage guidelines: Single comforter: 1 Blankets: 3-4 Cushions: 3-5 Regarding vacuum cleaners that cannot be used: *Please check the images on the page for details. Storage period guidelines: If there are no abnormalities in the compressed state after 6 months, you can store them as is, but the recovery rate will be slightly worse. For the sake of the stored items, take them out of the compression bag once every 6 months, sun-dry them, and re-compress them. Related keywords: Futon compression bag, futon storage, clothing, pump, extra large, vacuum cleaner, stick vacuum cleaner, blanket, futon, storage, seasonal change, integrated, futon compression bag, L, vertical storage, SAKuRAKu