I can't find what the sizes in "package size" do to the postage rate. There's 3 choices for an oversized package ( Oversize 1. 2 & 3) plus a checkbox for irregular size... but they don't seem to match the USPS rate categories. USPS adds a $2.90 surcharge for a "non-machineable" Parcel Post package so which one of this sizes does that for me? Since there is no surcharge for the same oversized package in Priority Mail I can't just add the $2.90 in the handling. Is there a way to enter info and check the rate to see what it gives prior to listing it? Thanks...
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