Backpack with cooling and temperature-lowering functionality

A backpack with cooling and temperature-lowering functionality comprising

• a backpack main body (1) with a cavity (10) and shoulder straps (2) mounted on the backpack main body (1), wherein
• a ring-shaped flexible protrusion (11) is placed on a backside of the backpack main body (1), upon which is a layer of flexible support (12) for contact with the human back;
• a chamber (13) is formed between the back of the backpack main body (1), the ring-shaped flexible protrusion (11), and the flexible support (12);
• and
• a cooling unit (3) located on an outer side of the ring-shaped flexible protrusion (11) includes
• a housing (31) detachably mounted on the backpack main body (1),
• a TEC cooling plate (32) located inside the housing (31), and
• a fan (33) for drawing external air and blowing the external air towards the cooling end (321) of the TEC cooling plate (32) to generate cold air;
• the housing (31) has a cold air nozzle (34) inserted through the ring-shaped flexible protrusion (11) and extending into the chamber (13) to input cold air.