Along with most major airlines, US Airways adheres to a 50 lbs. limit for economy checked bags and Anything heavier will incur additional charges. Carry-on bags are limited to 40lbs.
US Airways charges for bags on all flights, except for Europe, South America and the Middle East. The first bag costs $25, the second $35 and the third $100, as of October 2010. To Europe the first is free and the second $55.
US Airways carry-on mass is limited to 45 inches in linear dimension (length plus width plus height). The limit for total dimensions of checked baggage is 62 inches.
Passengers can carry one bag and one smaller personal item on to the airplane. One which must be stowed in the overhead bin, and one beneath the seat in front.