Q242 : Does a half giants Powerful Build ability increase it's carrying capacity?
A242 ...
NO ... notice:
Powerful Build: The physical stature of half-giants lets them function in
many ways as if they were one size category larger.
Whenever a half-giant is subject to a size modifier or special size modifier
for an opposed check (such as during grapple checks, bull rush attempts, and trip attempts), the half-giant is treated as one size larger if doing so is advantageous to him.
A half-giant is also considered to be one size larger