HI Brian,

Here is the information regarding UA baggage weight & size limits:

International travel baggage information

Customers traveling to to/from the United States and all international destinations are required to have their baggage checked 45 minutes prior to flight departure time. United Airline’s maximum free baggage allowance for international travel is two pieces per ticketed customer and each piece is not to exceed 50 pounds/23kg. The following policy applies to all international travel to/from the United States and all international destinations:

International destinations (excluding travel to/from Brazil, Japan, El Salvador, Dominican Republic, Honduras, Haiti and The Philippines):

Economy Class
2 bags, maximum 50 pounds/23kg each

First or Business Class
2 bags, maximum 70 pounds/32kg each

1K Premier Executive,
Premier Executive and
Star Alliance Gold Members
3 bags, maximum 70 pounds/32kg each

Military customers on tour
2 duffel bags, sea bags or B-4 bags up to 70 pounds/32kg and 115 linear inches/292 cm

Maximum linear dimensions of all bags: 62 inches/158cm (length + width + height) each

Travel purchased after 9/7/2005: checked baggage more than 50 pounds/23kg and not exceeding 70 pounds/32kg will be charged at the rate of $50.00 per piece.

Fees for baggage more than 70 pounds/32kg or exceeding the maximum linear dimensions vary by destination. Contact United or your travel agent prior to your trip for details.