You mean, like the first box cooker on the page?: http://solarcooking.wikia.com/wiki/Minimum_Solar_Box_Cooker http://solarcooking.wikia.com/wiki/Minimum_Solar_

You mean, like the first box cooker on the page?: http://solarcooking.wikia.com/wiki/Minimum_Solar_Box_Cooker http://solarcooking.wikia.com/wiki/Minimum_Solar_Box_Cooker Like the cooker in the article, it is a foil-lined cardboard box, with a black-painted cardboard box inside. And it recommends a plastic bag instead of a plexiglass cover, so it might be considered even more basic than the one in the article.