and thus also tilted slightly outwardly but preferably is folded and glued in position such that when the container is erected vertical support strip 84 is precisely vertical or at least more nearly vertical than exterior panel 65 for corrugated material the flutes are oriented vertically and in any event the vertical orientation of vertical support panel 84 maximizes the vertical compression force that the container can bear when disposed in a stack under other similar containers nested above when erecting container 10 each end wall 25 is rotated inwardly about transverse fold 34 and each wing 69 is also rotated inwardly about fold 71 until it is oriented in substantially perpendicular relation to exterior panel 65 in this position and in the embodiment shown each support tab 75 protruding downwardly from wing 69 is positioned in contacting engagement with longitudinal fold 33 to erect front wall 15 and back wall 20 inner panels 43 of front wall 15 and back wall 20 are each folded downwardly and inwardly by 180 u00b0 relative to outer panels 40 about longitudinal folds 45 and 33 respectively preferably fold 45 is wide enough to admit wing 69 between inner and outer panels 40 43 namely one thickness of material in this embodiment thus inner panel 43 rotates inwardly by 90 u00b0 about longitudinal fold 45 and downwardly by 90 u00b0 about longitudinal fold 33 this folding operation causes locking tabs 52 of inner panel.