



 
Steve, I doubt if there is one; I would expect that this is determined by somebody filling the bag with some sort of simulated garbage [plastic blocks say] to what seems like a reasonable level, then measuring the total volume with (say) a fivegallon bucket. Where there is a range, I would assume the low end is for heavy or "poky" contents, the high end for dry leaves, wastepaper, etc. RD
 


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