If you really do need both a printer and a scanner on the road, the least burdensome option might be something like the HP OfficeJet 250 Mobile All-in-One, which measures 3.6 by 15 by 7.8 inches ...
As of Dec. 4, you can snag an HP DeskJet wireless all-in-one color inkjet printer, scanner, and copier for just $59.99 at ...