[EricH]

Is the total weight of ALL fabricated items under 30 lbs? If so, then you should be OK. If it is NOT under 30 lbs, then take off any COTS items and reweigh the fabricated items. Repeat until you have no more COTS items that can be removed or you are under 30 lbs, whichever comes first. (If running out of COTS items comes first, bring raw material in place of some of the fabricated items and re-fabricate them at the event.)