inserted into the end tubes 81 and have threaded ends the end panels 41 and the side panels 42 have a series of molded in vent slots typically 48 amp 49 respectively which not only provide ventilation for products placed in the bin that require air circulation such as produce but also provide additional strengthening to the panels the end panel and side panel vent slots show the center group of vent slots at 48 amp 49 configured in the center of the panels so that the center of the wall is strengthened in the longitudinal direction to reduce the possibility of outward wall bowing due the outward force of the product loaded inside the bin the top portion of the end panel wall 41 is thicker than the lower major portion of the wall as shown in fig1 amp fig7 the purpose of the slope 51 on the inside of the end panel 42 at the top as shown if fig1 is to provide the transition to the narrower section below in order for the side wall 42 to blend in with this transition on the top inside corner of the side wall 42 at 51 is configured to blend in with this slope the pallet base 40 shown in fig2 is provided with inward stepped sections on the bottom of the legs on the full length of the left outer leg 56 the ends of the center leg 57 and the full length of the right leg 58 to provide positive stacking interlock where this recessed section on the bottom fits into the top of.