The invention discloses an endothermic heat dissipation bag comprising: a body unit and at least one shoulder strap. The main body unit is divided into an inner side and an outer side, and is a bag body which internally forms an accommodating space. The body unit is provided with a water injection part. The body unit can be combined with the shoulder strap for back wear or sewn on the clothes. When the heat absorbing heat sink of the present invention is used, water is poured into the accommodating space in the body unit by the water injection portion, and the inner side of the body unit can release water in a small amount and absorb heat to reduce the body temperature of the user. The outer side can dissipate the heat absorbed by the body unit and has a waterproof function.本新型揭露一種吸熱散熱袋，包含：一本體單元以及至少一肩帶。其中，本體單元分為內側與外側，為一內部形成容置空間的袋體，本體單元上方設有一注水部，本體單元可與肩帶結合供背戴使用，或車縫於衣服上使用。當使用本新型的吸熱散熱袋時，藉由注水部將水灌入本體單元內的容置空間，本體單元的內側可以微量地釋出水份並吸熱，以降低使用者的體溫，本體單元的外側則可將本體單元吸取的熱量散發且具有防水作用。
