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Lifeline knows the importance of safety when enjoying the great outdoors or open highway. Because adventures don’t always go the way we plan, Lifeline manufactures the best in outdoor and road safety products to help keep you prepared for those unforeseen disasters. How Does It Work? Lifeline’s Vacuum Insulated double wall growlers keep liquids hot and cold through using the best insulation technologies available. Instead of simply using foam insulation, or using a simple double wall construction, Lifeline’s 50/50 growlers are vacuum insulated between the two layers of the stainless steel water bottles. A vacuum is a space that contains no atoms which in turn eliminates conduction and convection allowing for the beverage inside to stay hot or cold depending on what you have pu