the right and left portions of the wrapper 1 overlap each other both on the top and ends of the package the right and left portions are fused together by pressure or heat as indicated at a indicated by the oblique lines in the wrapper 1 a series of perforations 6 hereinafter referred to as the perforation line 6 are cut in the form of stitches near and parallel to the overlap region a in such a manner that the perforation line 6 extends longitudinally of the case 2 preferably the perforation line 6 is formed in the right portion of the wrapper 1 which is top most in the overlap region a a cut 7 is formed in the lower one of the overlapped right and left portions of the wrapping film substantially at their middle in such a manner that it is located beside the perforation line 6 arrow marks 5 and 5 39 indicating wrapping film tearing directions are printed on the wrapping film on both sides of the perforation line 6 preferably opposite the overlap region a in addition an instruction label 8 which describes the method of tearing the wrapping film is also printed on the wrapping film as indicated at c the thumbs of both hands are pushed against the arrow marks 5 and 5 39 respectively and moved away from each other in the direction of the arrows 5 and 5 39 to tear the wrapping film along the perforation line 6 thereby to form a tearing part d the tearing part d is pulled outwardly as shown in fig3 the tearing part d thus pulled is further pulled round the case 2 as.