FEATURES of the Hydro Flask 21 oz Lightweight Standard Mouth Trail Series

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• Ridiculously light, and durable enough for any trail
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• Standard mouth lightweight trail series bottle 25% lighter than our other 21 ounce bottles and provides best cold hydration experience for your longest adventures.
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• Narrow standard mouth opening is ideal for quick sips on the trail, and the slim bottle profile stashes easily into a pack pocket.
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• Engineered to deliver lasting cold refreshment with our TempShield insulation in an innovative lightweight stainless steel design