On the average, 100 sq inch of 0.062" FR4 PCB will weight 0.4 lbs to 0.55 lbs depending on configuration. Due to weight of packaging material (0.3 lbs) only 0.7 lbs of PCB can be included in the first lbs of shipment. In some cases, such as tab-routed or v-scored panels - the panel support boards (to avoid breakage during shipping) may add to the shipping weight. To help our customer save on shipping cost, we will always use the lightest and smallest packaging method.