mentioned reinforcement at each corner of the carton 9 is provided by the angled configuration augmented by struts 34 40 in fig3 partial closure of the end of the carton is achieved by placing the top end closure flap 26 27 in perpendicular alignment with the top 12 13 and bottom 10 walls of the carton 9 when the top end closure flap 26 27 is placed in this upright position the secondary strut tab 40 is aligned along the angled edge of the corner as shown in fig3 the corners of the carton 9 are thus reinforced by a pair of struts 34 40 referring now also to fig4 the bottom end closure lap 22 is placed upright and the closure tab 42 is placed over the angled corner the closure tab 42 completely closes off the corner of the carton 9 and holds the secondary strut tab 40 in place the sealing tab 44 is affixed to the side wall 16 by any suitable adhesive used in carton packaging affixation of the sealing tab 44 holds the closure tab 42 in place and completes the sealing of the carton 9 as previously mentioned each corner structure is identical and thus the structure described is applicable to each corner of the carton 9 in general each corner is effectively sealed and aided in reinforcement by its associated side wall 16 18 closure flaps 20 22 24 25 26 27 primary strut tab 34 secondary strut tab 40 closure tab 42 and sealing tab 44 the seal provided by the carton 9 greatly increases the integrity of the carton 9 the manner in which the seal holds the secondary strut tab.