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The Hydro Flask 40oz Wide Mouth Trail LW Flex Cap Water Bottle sheds 20% of the weight of other bottles in its class yet retains all the benefits of a stainless-steel construction. The double-wall vacuum insulation keeps contents cold for 24 hours or hot for 12 hours, while the pro-grade steel holds up against rugged terrain and doesn't transfer any flavor to our bevvy, giving us perfectly crisp sips of H20 on the go.