What is the baggage allowance for international travel between PDX and Australia. I can't find an answer via the website and calling the airline doesn't give me an option to ask the question. Thank you for your help.

As a general rule of thumb, the majority of international airlines allow one personal item such as a purse, briefcase, or backpack, one carry on item conforming to the new carry on dimensions, and two checked luggages. The two checked luggages usually have to be 50 lbs or less or 23 kgs or less. If not, your luggage is considered overweight, then you are given the option to take out items to reduce the weight or pay an additional overweight charge at a cost of $50 to $80 depending on the airline.

How long is the trip to downtown?

I would plan on 50 if the airlines doesn't give you a higher number.

It depends on your carrier, but most of them do 50 lbs, 23 kg.