https://www.soopot.com/product/coffee-vacuum-jug/stainless-steel-vacuum-jug/ The coffee vacuum jug, a vessel of elegance and utility, is designed to maintain the temperature of its contents, primarily coffee, for extended periods. Its ability to do so is rooted in the principles of thermal insulation, a concept that has been harnessed by scientists and engineers to create a variety of heat-retaining products. The vacuum jug achieves this through a dual-walled construction, a design that is both ingenious and effective.