Flat vessels, such as RAFTS, are vessels that are designed to float on the surface of water. They are typically constructed from wood, plastic, or metal and are used for a variety of purposes, including transportation, fishing, and recreation. RAFTS are a type of flat vessel that is usually made up of multiple logs, barrels, or other materials that are lashed together. They are often used for recreational activities such as river rafting, but can also be used for transportation and fishing.