A single facer media is provided according to the invention. The single facer media includes a fluted sheet attached to a facing sheet and having a first end and a second end so that when the single facer media is formed into a media pack, the first end or the second end forms a media pack first face, and the other of the first end or the second end forms a media pack second face. Adhesive is provided between the fluted sheet and the facing sheet at the first end or the second end, and wherein the fluted sheet and the facing sheet are pushed together and adhered together at the location of the adhesive to provide a seal between the fluted sheet and the facing sheet. At least 25% of the flutes of the fluted sheet comprise at least one ridge extending along at least 50% of the flute length between adjacent peaks. Filtration media packs, filter elements, and methods for forming a single facer media are provided.