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Made of aluminum, the 18-ounce flask is both durable and lightweight, great for rigorous, extended activity like hiking or camping. The screw-on lid won't leak, and the drinking edge is smooth and comfortable, with the threads on the inside. The lid has an attached carabiner, so the flask can be clipped to bags and backpacks. Everything is completely BPA free, and hand washing is recommended. Do not microwave or use abrasive cleaning products.