Fish and Chips boxes with Metalised PET inner coating. They have 2 ventilation openings, so that water vapour is not "trapped".
They are containers for placing and transporting food, similar to those used in a grill. Available in 3 sizes, with a print referring to the British meal of the same name.
Place fish and chips, fishcakes, fish or seafood and transport the flavours unaltered, in a package.