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Pyramid stacking is a semi-permanent structure of barrels that are stacked upon each other with wood wedges to secure their location. Barrels are first stacked empty, and once filled they do not move. This method requires less space horizontally than using barrel racks, however, if a barrel on a bottom row needs to be removed then all of the barrels above it also need to be emptied and moved. Barrel racks are also costly. Mobility of barrels is therefore sacrificed for spaceand cheaper cost. Another benefit of pyramid stacking is that a [https://www.facebook.com/photo.php?fbid=10101163850672808 forklift] is not required. See also [https://www.facebook.com/groups/MilkTheFunk/permalink/1932486870112851/?comment_id=1932686786759526&reply_comment_id=1932706406757564&comment_tracking=%7B%22tn%22%3A%22R9%22%7D Andrew Zinn's list of benefits to pyramid stacking].