Originally Posted by
number_6
as a point of comparison, and 32kg/70lbs is the absolute max for any airline/airport in the world due to health/safety regulations).
Many airlines/airports allow up to ~100 lbs/45kg. Sydney is NOT one of those airports...
32kg/70lbs is the lowest common "maximum" through, so it's still a safe guideline.
UA's website has a list of some of the airports that limit to 32KG -
http://www.united.com/page/article/1,,52907,00.html