Abstract: A heating or cooling sack container comprising at least a primary compartment (5) for containing a product (6) and at least a first secondary compartment (7). The container further comprises a first chemical compound (9) inserted in the first secondary compartment (7) and at least a breakable container (10) inserted in the first secondary compartment (7) in contact with said first chemical compound (9). The breakable container (10) contains within it at least a second chemical compound (11), which, if placed in contact with the first chemical compound, gives rise to a chemical reaction producing a temperature gradient. Tee primary compartment (5) is provided with opening means (12) to allow the extraction of the product (6) contained therein. An alternative embodiment further comprises a second secondary compartment (21) also containing the first chemical compound (9) and a second container containing the second chemical compound (11).