Book mailer construction

Claim 1

A SHIPPING FOLDER FOR A BOOK OR SIMILAR ARTICLE, COMPRISING A NORMALLY OPEN SIDED CONTAINER ADAPATED TO HAVE THE OPEN SIDES CLOSED UPON THE ARTICLE INSERTED THEREIN, AND THE CONTAINER BEING FORMED OF A PAIR OF RECTANGULAR PANELS ADAPTED TO BE SPACED ONE FROM THE OTHER IN PARALLEL RELATION TO ACCOMMODATE SUCH ARTICLE THEREBETWEEN, THE ENDS OF THE CONTAINER HAVING FORMATIONS ADAPTED TO CONTACT THE END OF AN ARTICLE SHORTER THAN THE FOLDER, EACH OF SAID PANELS HAVING PARALLEL SIDE EGES AND END EDGES SO THAT THERE ARE PAIRS OF EACH ADJACENT EDGES ON THE SIDES AND ENDS OF THE CONTAINER, THE SIDE EGES BEING PROVIDED WITH HINGED FLAPS, THE FLAPS OF SAID SIDE EDGES BEING COEXTENSIVE WITH THE SIDE EDGES, THE FLAPS OF EACH PAIR OF ADJACENT SIDE EDGES BEING ADAPTED TO BE OVERLAPPED AND CONNECTED, TO FORM THE CLOSED SIDES OF THE CONTAINER, EACH END CLOSURE FORMATION BEING OF INWARDLY COLLAPSING PLEAT CONSTRUCTION, SAID END FORMATIONS ALONG ONE OF THEIR END EDGES BEING HINGEDLY CONNECTED EACH TO ONE OF TWO DIAGONALLY OPPOSITE END EDGES OF SAID PANELS; AND BEING SECURED IN A FIXED FACE TO FACE POSITION, EACH TO ONE OF THE OTHER TWO DIAGONALLY OPPOSITE END EDGES OF SAID PANELS, ALONG THEIR OTHER END EDGES, AT LEAST ONE OF SAID END EDGES BEING RELEASABLY SECURED IN SAID FIXED FACE TO FACE POSITION BY MEANS ADAPTED TO PERMIT EASY SEPARATION OF THE SURFACES ATTACHED TO EACH OTHER.