A blood transfusion bag is a container used to store and transport blood. It is usually made of plastic or other sealable material and has a certain capacity and transparency so that medical personnel can observe the color and flow of blood. A blood bag usually has the following parts: 1. Main bag: The main container used to store blood, with a scale line to measure the volume of blood. 2. Anticoagulant bag: used to store anticoagulant to prevent blood from clotting during delivery. 3. Blood transfusion tube: The tube connecting the main bag to the infusion set or transfusion needle is used to deliver blood to the patient. 4. Label: used to record important information such as blood type, blood type, collection time, etc., to ensure the accuracy and safety of blood transfusion. Blood transfusion bags are widely used in the medical field, often used in blood transfusion surgery, treatment of anemia, hemostasis, and other situations. In the transfusion process, the medical staff will collect the blood from the donor into the transfusion bag, and then deliver the blood to the patient through the transfusion tube to meet the needs of the patient's blood