Why does the rate for First Class Mail shipping jump so much when the weight gets close to a pound?
A17: You’re using Google Cart; they have a bug in their setup which fails to recognize that certain classes of shipping have a sharp upper limit on the maximum allowed weight. For USPS First Class Mail to a destination in the US, that’s 13 ounces. Since Google Checkout requires that there be a rate for “and up”, we made the cost of the next step high enough that we figured that you would get the idea that you should use Priority Mail instead. If Google Checkout allowed us to define First Class Mail shipping as simply not being applicable to any order with a weight of 14 ounces or more, we wouldn’t have to put in those absurd prices as a fake option.