1. A METHOD OF MAKING EXTENSIBLE PACKS OR SHEET MATERIAL ARRANGEED IN ZIGZAG FORMATION COMPRISINSG THE STEPS OF: PROVIDING A PLURALITY OF RECTANGULAR SECTIONS OF SHEETS MATERIAL OF EQUAL DIMENSION EACH DEFINING OBVERSE AND REVERSE FACES AND FIRST AND SECOND OPPOSED PARALLEL EDGES; PROVIDING EQUIDISTANTLY SPACED PARALLEL LINES OF ADHESIVE TO THE OBVERSE AND REVERSE SIDES OF EACH SHEETS, WITH THE ADHESIVE LINES ON THE OBVERSE SIDE OF EACH SHEET ARRANGED IN ALTERNATELY STAGGERED RELATIONSHIP WITH RESPECT TO THE ADHESIVE LINES ON THE REVERSE SIDE OF SAID SHEET; STACKING SAID SECTIONS OF SHEET MATERIAL ONE UPON THE OTHER WITH THE ADHEHSIVE LINES ON THE OBVERSE SIDE OF EACH SECTION CONTIGUOUSLY ALIGNED WITH THE ADHESIVE LINES ON THE REVERSE SIDE OF ADJACENT SECTION DISPOSED TO EITHER SIDE OF SAIDD FIRST MENTIONED SECTION; SECURELY ADHERING THE SECTION IN THE STACK TO ONE ANOTHERR ALONG THEIR CONTIGUOUS LINES OF ADHESIVE; THEN SLICING SAID STACK ALONG THE MEDIAL LENGTHWISE AXIS OF EACH CONTIGUOUSLY ALIGNED COLUMN OF ADHESIVE LINES TO FORM A PLURALITY OF EXTENSIBLE PACKS OF SHEET MATERIAL ARRANGED IN ZIGZAG FORMATION.