Heavy duty waterproof compression bags. High frequency welded 2-D compression bags with roll-top closure and seal lip for enhanced waterproof performance. Quick and simple compression through a large purge valve. The flat/slim design, ample attachment points, durable 210D nylon fabric, taped seams, DWR treated roll-top closure webbing make these bright bags ideal waterproof compression bags for all watersport activities. Can be used as Exped mat inflation aid in combination with a Schnozzel (not included).