end panels 20 a and 20 b to fold outwardly along the scored inclined fold lines 32 formed therein and inwardly along line 28 drawing the upper side flaps inwardly as seen in fig6 upon pressing the upper end flaps into a flush disposition with the upper end of the container and pressing the upper side flaps 18 a and 18 b downwardly thereover the carton is closed as illustrated in fig7 whereupon a flexible closure strap 42 can be centrally disposed about the carton and fixed in place sealing the filled carton as seen in fig8 the closure strap 42 is positioned such that it runs parallel to the outer end 19 of the exposed upper side flap 18 a the heights h u2033 of the two upper side flaps 18 a and 18 b are preferably equal to each other and exceed the transverse dimension of the formed carton so that when the upper end and side flaps are folded flush over the end flaps and secured with strap 42 the exposed end 19 of the uppermost upper side flap will extend parallel to and be spaced laterally from the securement strap 42 a distance of about 1 5 to 2 5 inches and more preferably 1 0 to 2 0 inches so as to ensure securement of the flap by the strap while allowing the portion 44 of the exposed flap between strap 42 and end 19 which is anchored by the strap to function as a convenient carrying handle for.