The reason is simple, with the growth of shipping because of on-line retailing, shippers need to utilize every inch of cargo space. Weight plays a factor of course because a truck or airplane has weight limits, but space is an even bigger factor,it is a lot more limiting that weight carrying capacity unless you are shipping lead or gold With every cubic inch a package takes up, there is less for another package and loss of revenue (it is kind of similar to lingering at a restaurant during peak times, the longer you stay the less people they can seat that night, less revenue, unless of course while you linger you are buying (overpriced) liquor. Whether an item weighs 5 ounces or 5 pounds, a 5 oz item in a 50 cubic inch box costs them more than a 5lb box in 30 cubic inches in lost revenue opportunity.
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