Abstract: The present invention relates to a fluid tight tape for a perforable package or packet, which perforable package or packet is particularly suitable for containing under vacuum foodstuff to be thermally treated, comprising: a laminar body (2), made of elastically deformable material and resistant to relatively high temperatures, designed to be applied to the perforable package or packet suitable for containing the foodstuff to be thermally treated; a glue means (4) provided at one face of the laminar body (2) facing, in use, the package or packet, the glue means (4) being designed to make the laminar body (2) tightly adhere to the package or packet, the laminar body (2) having a bare area (5), lacking glue, at which a through opening (6) is obtained.

Abstract: The container is formed out of a blank and possesses considerable mechanical strength as a consequence of the thickness of the sides being doubled through first parts, the thickness of the bottom being doubled through second parts, the ends offering notable resistance to flattening due to the presence of strengthening edges, the thickness of the said ends being doubled in the region of the corresponding central areas and, lastly, the end pieces of the sides being locked to the strengthening edges of the said ends.