fig7 in addition strips of fabric material 158 are located in the corners between geogrid 154 and sidewalls 150 at each bodkin connection 152 the fabric strips also aid in the escape of sand fill material at the bodkin connections in fig8 an alternate arrangement of a course of a plurality of boxes 128 is shown in this arrangement the boxes 128 include exterior sidewalls 130 as shown in fig4 and three additional sidewalls 160 the boxes 128 in fig8 assume a rectangular configuration in a 34 ladder 34 arrangement due to the limited width of each box 128 the connection of adjacent boxes 128 by bodkin connections 162 helps retain the shape of the box while allowing some flexing when filled when grid is used as the sidewall material a fabric material 164 preferably a geotextile liner is used along the exposed sidewall 130 160 to retain fill material of a size less than the openings of the grid as shown in fig5 a plurality of vertical expansion boxes 132 are positioned on top of a lowermost row of vertical expansion boxes 128 it is understood that successively superimposed rows of vertical expansion boxes for example 134 and 136 may be placed on top of lower courses of vertical expansion boxes to a desired height to accommodate expected landfill waste deliveries it is not necessary to completely line the sidewalls 92 of.