Platypus Gravity Works 4.0L Replacement Reservoir. Specifications for Platypus Gravity Works 4.0L Replacement Reservoir: Manufacturer: Platypus Color: White Fabric/Material: Urethane and Food-grade Polyethylene Weight: 5.04 oz Capacity: 4 liters Features of Platypus Gravity Works 4.0L Reservoir Bladder: Unique dual-layer laminate combines a rugged exterior with a food-grade taste-free interior. Reservoirs are interchangeable with any GravityWorks system allowing you to create the capacity you need for any trip. 4.0L Kit includes: 4.0L Dirty reservoir with quick-disconnect fitting and a 4.0L Clean reservoir. Package Contents: Platypus Gravity Works 4.0L Replacement Reservoir Platypus Gravity Works 4.0L Replacement Reservoir 3136