Ecwid itself doesn't calculate the real-time rates. It just sends the information about the order - i.e. weight, destination and origin addresses - to the shipping carrier's server. Then it gets a response with the rates and show them to customer. Therefore, you are not able to affect on this method appearance.
In order to allow your customer to choose the package type I suggest you to create two user-defined shipping
methods, where depending on the order’s weight you will be able to define, which products has been ordered and what package should be used.
Maria Nikiforova, Ecwid Team
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