Metal sheet pans and glass baking dishes need different handling. Metal nests and stacks fine with paper between pieces, but glass dishes deserve individual protection since a chip or crack in glass can mean a shatter later in the oven.
Pro tip: A folded towel inside a glass casserole dish doubles as protective packing without adding a whole separate item to find room for.
Watch out: Never nest a glass baking dish directly against metal bakeware; the harder metal edge is a common cause of a chip that later becomes a full crack under oven heat.