A device for applying at least one product at a desired surface, for instance a human's skin. The device comprises several layers 1-6, where an impermeable front layer (1) and an impermeable utility layer (6) together with a contact layer (2) will form the outer surfaces of the device (D), between which contact layer (2) and utility layer (6) are arranged a valve layer (3), a top layer (4) and a bottom layer (5). The top layer (4) and bottom layer (5) are connected to each other through a weld (11) in order to form a storage chamber (8) to accommodate a product. Furthermore, the valve layer (3) and top layer (4) are provided with a plurality of incisions or indentations (9a, 9b), where the incisions or indentations (9a) of the valve layer are welded to corresponding incisions or indentations (9b) of the top layer to form an opening mechanism in the device (D), where the device (D) is opened when the valve layer (3) is moved relatively to the top layer (4).