With the Platypus CleanStream Replacement Reservoirs, you can replace worn out or damaged reservoirs, or adapt the capacity of your existing GravityWorks system to meet the needs of any trip. 2 L Dirty Reservoir Replacement Kit is a collection reservoir for dirty water in the GravityWorks 4 L Filter system Campmor Item 84072 and GravityWorks 2 L System Bottle Kit Campmor Item 84071. Unique, dual layer laminate combines a rugged exterior with a food grade, taste free interior. Contains one reservoir for dirty water. Reservoir is 2 liters Reservoir for unfiltered water has quick disconnect attachment. Made in USA.