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If you're concerned about damaging pants, or you need to show up to your destination and wear them without time to iron them, use a suit bag that will allow you to pack them vertically without folding them in half. This is the best way to keep your pants wrinkle-free. Affix the pants to a pants hanger that won't damage the fabric. Some pants hangers require folding the pants in half at the knee and draping them over the top of the hanger. Store them neatly in your suit bag, making sure they're completely straight so they'll remain wrinkle-free.
Pack the dressiest pants in a suit bag.