A medical bag is a portable plastic bag designed to hold and transport medical supplies and equipment. Medical bags are commonly used by healthcare professionals such as doctors, nurses, and paramedics to carry the necessary supplies needed to provide medical care in a variety of settings. There are some types of medical bags, such as blood bags and iv (serum) bags. Blood bags are plastic bags used to store and transport donated blood or blood products, such as red blood cells, platelets, or plasma. IV (serum) bags are similar, but they are used to store and transport serum, which is a clear, yellowish liquid that separates from blood when it is allowed to clot. Serum is often used in medical treatments and can be used to treat a variety of conditions, such as dehydration, burns, and shock.