USPS module will not calculate shipping if the weight in the shopping cart exceeds their maximum weight limit for a box/country which each country has different weight limits for a box. So for example the US I believe is 70 lbs while Canada is 60 lbs. It would be nice to have an option in the USPS setup to have it automatically if enabled split total weight in cart into multiple boxes if it exceeds the shipping destinations maximum weight for a box. That way larger orders can be handled more smoothly. I know this will not work for everyone that is why it should be an option, but in my case would work perfect because I can easily split an order into multiple boxes because not one item that I sell weights over 5 lbs each.

So for example a order shipping to Canada with a shopping cart weight of 76 lbs would calculate shipping base on two boxes being 38 lbs each, if this feature is enabled.

As of right now the only way for my customers to place these larger orders that exceeds their country's weight limit is to place multiple separate orders which is not very user friendly.