Soft Rubber Vacuum Flask Rubber Water Bottle 304 Stainless Steel Water Bottle Rubber Paint

Vacuum flasks, also known as thermos flasks, are used to keep drinks or food warm or cold over a prolonged period. They work by having a double-walled container, with a vacuum space between the two walls. This vacuum space prevents heat transfer from the outer wall to the inner wall, keeping the contents of the flask at the desired temperature. Vacuum flasks are commonly used for hot drinks such as coffee and tea, as well as cold drinks such as water and juice. They are also used for storing and transporting food such as soup and stew. The design of vacuum flasks has been around since the late 19th century, with the first patent being filed in 1892 by Sir James Dewar. Since then, vacuum flasks have been widely used, and their design has improved with the addition of features such as spill-proof lids, easy-pour spouts, and handles for easy transportation. Overall, vacuum flasks are a convenient and practical way to keep drinks and food at the desired temperature for longer, making them an essential item for many people, especially those who are always on the go.