Nalgene Flask 350ml For quick refreshment, reach for the NALGENE FLASK. Whether you keep it in your pocket, your purse or your pack, it stays neatly tucked away when not in use. NALGENE ingenuity makes it leakproof; a slender profile makes it bulkproof. 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 Flask weighs 122g. If you take off the sleeve and the shot cap the weight drops to 53g.