The flexible container (1) with incorporated internal thermal exchange is shaped like an envelope or bag cascade multipocket inside. It is an administrator, portable disposable dispenser of a consumer and/or necessity product to be heated or cooled, exploiting endothermic or exothermic reactions generated by breaking by pressure of the bag (3) of the reactive liquid (31). The peculiarity of this execution is that the reaction chamber (2) is fully immersed into the consumer product (6) and is provided with a valve (10) controlling a possible pressure generated by the chemical reaction, the reaction bags (3, 4) inside developing the concept “bag in bag” or “bag in bag in bag”.