I don't know if that link will be there in the long term but here is a quote:
Anyone have any thoughts about how this will affect them? Personally I have about 1/2 of our 4K products that have dimensions. For us it'll be quite a pain to get the other 1/2 and then keep up with the new products.UPS plans to expand dimensional-weight pricing, which determines cost by measuring exterior package size, beginning Dec. 29. Shipping prices are based on dimensional weight if it exceeds the actual weight.
I wonder how this will force a change in the UPS extension currently in OpenCart?
Mike