Platypus GravityWorks 4.0L Filter System Color:One Color an improved BPA-free food-grade lining

an improved BPA-free food-grade lining ensures better-tasting water and can handle freezing

breathability

Wherever you're going and whatever you're doing

designed with a transverse taper that permits sideways placements in flares and shallow seams

the perfect length to get out for regular cardio and calorie burns without completely emptying the tank

Platypus GravityWorks 4.0L Filter System Color:One Color an improved BPA-free food-grade liningThe reviews keep coming and one thing is clear, the GravityWorks system is changing how people filter water. Delivering four liters of filtered water is just 2. 5 minutes with no pumping, there's simply no easier or faster way to get safe water away from home. Ideal for bigger groups, the system's eight liter capacity eliminates both the worry and hassle of keeping plenty of water around for anything you need.