3M™ DBI-SALA® Rollgliss™ R550 Humidity Resistant Case is made with rugged, extra-durable polyethylene and an air-tight seal that keeps Rollgliss™ R550 Rescue devices protected against moisture, sun, and exposure to debris. A large storage capacity allows industrial pros to carry up to a 500-foot rescue system, and with an external humidity indicator, they can check on the internal moisture content without having to open the lid.