Express shipment are done with:

DHL, UPS, TNT or FedEx

An example of 10 lb (4.54 Kg) of mail is:

4 Time Magazine (0.35 each) 1.40
4 NewsWeek (0.25 each) 1.00
The Economist (0.45 each) 1.80
30 letters (0.05 each) 1.50
Yahoo Internet Life (0.50 each) 0.50
Architectural Digest (2.20 each) 2.20
Cigar Aficionado (1.45 each) 1.45

Total:

 9.85