Our Soft Crease, Klearfold clear folding cartons are the most recommended machine-fill plastic cartons by leading filling line equipment manufacturers. The precision and uniformity of Soft Creases ensure that Klearfold cartons run efficiently on even the highest speed cartoner equipment. Machine filling APET and RPET cartons was once considered a monumental challenge…that is, until HLP Klearfold perfected the Soft Creasing of these materials.