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So, is the limit on total weight only? Or, do they also have a limit on number of pieces? I'm looking to check 4 pieces from PVG-PEK on MU next week. I fully expect to pay excess baggage fees, but the only instrument I'll have to do this with is my corporate U.S. Mastercard. Anyone know if this will be accepted? Will MU even accept 4 pieces of checked baggage? I am in C, FWIW (if anything at all).