Good stiff but thin good quality card can be difficult to find. Recently have found some cereal packets have changed. Oatibix and Kelloggs crunchy nut clusters, for two, have changed from the usual rather soft type to much firmer, looks same from outside but is medium brown on back. Far more rigid, and no need to prime it. Whether this is temporary I don’t know, looks too good to last though! Worth checking, its easy enough to tweak the edge of a packet without opening it. Needless to say I’m not an “influencer”!! Gerald Grudgings, Tywyn