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Portage and luggage trolleys are hard to find, so pack light. Philadelphia is a fairly casual city, although men will need a jacket and tie in some of the better restaurants. Jeans and sneakers or other casual clothing is fine for sightseeing. You'll need a heavy coat and boots for winter, which can be cold and snowy. Summers are hot and humid, but you'll need a shawl or jacket for air-conditioned restaurants. Many areas are best explored on foot, so bring good walking shoes.