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Esbit Vacuum Flasks are a convenient way to enjoy a hot meal or beverage in the field, at the office, or on the move. The vacuum-sealed flask keeps food hot or cold for up to 24 hours and the wide opening makes serving easy. Tests show that a flask filled with 208 degree F water in a 68 degree F environment will have temperature greater than 185 degrees F after 6 hours and greater than 167 degrees F after 12 hours. When you're ready to drink your hot coffee, hot tea, or soup, the outer lids doubles as a double-wall insulated stainless steel cups and you have a choice to use the screw plug with or without the push button for pouring function. A second plastic cup in also included which stores conveniently inside the outer lid.