Amazon.com This complete maintenance kit is intended for use with MSR's MiniWorks and WaterWorks micro-filtration systems. Made in the USA -- in Seattle, Washington -- the kit weighs just 1.1 ounces, and stows into a hard case (measuring 3.3 by 1.8 inches [W x D]) for easy storage and transport. Lifetime Warranty MSR products include a limited lifetime manufacturer's warranty against defects in materials and workmanship. About MSR MSR is part of a company named Cascade Designs, started by three friends and former Boeing engineers -- Jim Lea, Neil Anderson, and John Burroughs -- who were laid off from the aeronautics giant in 1971. Outdoor enthusiasts looking for the next great gear idea, they went on to design the world's first self-inflating mattress, the Therm-A-Rest. Today, Cascade Designs remains a private, family-owned company that has grown to be one of the most respected outdoor manufacturers in the world. Product Description A complete maintenance kit for both MSR MiniWorks and MSR WaterWorks microfilters. Includes instructions, all parts needed, and a carrying case. Made in the USA.