Flasks have been around since the 18th century and traditionally made of silver, pewter, leather and sometimes even glass. Today’s flasks are mostly made of durable stainless steel and come in all shapes and sizes. A typical flask is contoured to match the curve of the hip or thigh, and is known as a kidney flask, due to this distinguishable shape. Many flasks will have something known as a captive top which means it has a small arm that attaches to the top of the flask to keep the lid from getting misplaced once it’s taken off. The purpose of flasks was to discreetly carry alcoholic drinks and water for long trips across the country. The very old flasks that were made of glass were made of limestone, quartz and sandstone to name a few, and traditionally come in amber, green, blue or clear colors. Some flasks will come with a collapsible little shot glass but it is more common for people to drink directly from the flask itself. Flasks are commonly seen used by cowboys in the old Westerns on TV.