Pro tip: Never leave clothes in plastic garment bags; use ones made of cotton instead. Clothes left in plastic bags trap moisture and promote mildew growth. Cotton bags allow them to breathe.
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Plastic bags trap moisture, which quickly transfers to your clothing causing it to become mouldy. Cardboard boxes are easily infiltrated by vermin and pests like silverfish.
A lot of people travel with garment bags, since it's often the best way to transport a suit without it getting totally wrinkled. This is especially practical if you're flying first class on an airline with a closet, since you can hang it up.
The undetected openings and small entry points allow dirt, dust, moths, and other critters to subliminally enter the bag you had 'protected' your garments in and cause further unsuspecting damage.