A package which loads a stack of single films into an internally bladed daylight cassette, has a waisted middle part accommodating the stack, a strip for retaining the package in the cassette, a transverse weld following the retaining strip, a pull tab for pulling the package out of the cassette, a transverse weld in the pull tab and a pair of longitudinal welds in the upper and lower side of the pull tab with widened portions in the zone where the cassette blades enter, which welds continue to ...