Container with product visualization aperture

A window-finishing machine adapted to receive a container having a body, a first end, and a second end opposite the first end, wherein the body comprises at least a body ply and a film liner ply, wherein the body ply has an inner surface and an outer surface and defines at least one aperture therethrough, wherein the liner ply is adhered to the inner surface of the body ply and has a portion extending across said at least one aperture, forming a window of the container, and wherein the machine comprises:

• a. at least one first platen;
• b. at least one second platen, wherein the at least one first platen is adapted to engage the first end of the container and the at least one second platen is adapted to engage the second end of the container, wherein the engagement with the container is airtight;
• c. at least one machine pocket positioned between the at least one first platen and the at least one second platen, wherein the at least one machine pocket has an inside wall adapted to receive the window;
• d. a heating element extending through a through hole in the at least one first platen or the at least one second platen, wherein the heating element is positioned to heat the window of the container;
• and
• e. a pressurized air device that is adapted to release pressurized air into the container through the at least one first platen or the at least one second platen.