Leakproof Flask Color:Blue The Big Zip EVO delivers

The Big Zip EVO delivers a significantly higher flow rate than previous Platypus reservoirs and a host of new features

For tried-and-true security

your rods are securely locked and protected from the elements

Nothing is safer or easier to use for purifying the most demanding backcountry water sources than the Guardian purifier

Leakproof Flask Color:Blue The Big Zip EVO deliversNalgene ingenuity makes it leakproof; a slender profile makes it bulkproof. Wherever you're going and whatever you're drinking, take along a Nalgene flask. Its Hydration at its hippest. Contains 12 ounces (350 ml) Features one ounce cap Fits easily into bags and packs Provides long term storage solutions Includes durable insulation sleeve Prevents plastic taste and odor