The utility model relates to a heat pack bag, which has a main cushion body, the main cushion body extends along a predetermined direction and is in the shape of a long bag body, and a holding space is formed inside the main cushion body for loading a predetermined heat sink body, the top surface of the main cushion body is sequentially defined along its extension direction to form a back area, a bottom area and a side area, and the back area is respectively extended outward along two opposite sides of the extension direction of the main cushion body. The first sheet and the second sheet are respectively extended with a third sheet and a fourth sheet at the two opposite sides along the extension direction of the main pad.一種熱敷袋，具有一主墊體，主墊體沿一預定方向延伸而呈長形袋體狀，且於主墊體之內部形成有一可供裝填有預定吸熱體之容置空間，主墊體之頂面沿其延伸方向依序界定形成有一背區、一底區及一面區，背區於沿著主墊體延伸方向之兩相對側分別朝外伸設有一第一片體及一第二片體，而底區於沿著主墊體延伸方向之兩相對側則分別朝外伸設有一第三片體及一第四片體。
