40 is formed from a large flat rectangular blank piece of corrugated paper board d divided longitudinally into three sections 42 44 46 and a footer 48 first section 42 is a support and is folded downwardly along a fold line 52 until it is in generally perpendicular relation to the flat board d second section 44 is then folded downwardly along a fold line 54 until the end of the support 42 is in direct contact with the bottom of the third section 46 forming a generally triangular bracket 56 the third section 46 acts as the top of the bottom shelf 40 the footer 48 is folded downwardly along a fold line 58 until it is in generally perpendicular relation to the third section 46 a fully assembled bottom shelf 40 is illustrated in figure 5 the upper shelves 20 of the shelf unit a which have a generally triangular shape are inserted into generally triangular slots 14 of each side wall 12 12 u2032 and the shelves 20 are supported by the side walls 12 12 u2032 the bottom shelf 40 is also inserted into a slot 16 wherein the shape of the slot 16 is generally the same as the shape of the bottom shelf 40 the footer 48 includes first and second notches 62 64 which receive part of the side walls 12 12 u2032 and act as a locking device to secure the footer 48 in place the footer 48 traverses the lower front or face portion of the shelf unit a and rests on the floor or associated subjacent surface to.