8-5/8x11-1/8" flattened box from 1964. Front panel features jet and star-shaped cereal w/inset circle noting "Glowing Space Shapes - See Back Of Package." Full back panel has image of family in darkened room w/boy pointing to glow-in-the-dark space shapes on ceiling. These include ringed planet, jet, space capsule, alien, stars and moon. All top/bottom flaps of box have been neatly removed, and box has moderate handling wear/aging. VG/Fine. Comes w/original mailing envelope w/original General Mills, Inc. typed address and postmark labels. Envelope shows moderate wear w/aging and spotting along edges. Good. Contains complete and unused 9x11.5" stiff sheet w/glow-in-the-dark space shapes pictured on the back of the box back, as well as numerous letters. Corner tip wear, but still glows. VF. Scarce premium.