Re: USPS Shipping Module - RateV4, IntlRateV2 - Support Thread
It does that right now with volume filtering. The volume of all the USPS flatrate boxes is contained within the addon and it uses the volumes of the products to get a total volume of the products within the cart. If the volume of the product exceeds the volume of the box, the box is no longer available for the customer to choose.
One of my examples is that I know that I can fit 5 of one item within a small flatrate box and 7 of that item within an O--1996L box. If a customer orders 6 of that item, the small flatrate box is no longer an option. When they have 8 of that item, the Regional A flatrate and Med Flat rate boxes and larger are options.
Maybe I didn't understand your question.
Rick
RixStix (dot) com
aka: ChainWeavers (dot) com