We recently purchased a new pair of knee high boots, but with their stiff, unbroken-in leather, it was taking us ten minutes to pull them on in the morning. Then we talked to a clerk at the store, who gave us a great tip--and another way to reuse plastic bags.
Place a plastic bag around your foot and heel (between your calf and the boot)--and your foot will slide right in! Then, simply slip the bag back out.
Want other ideas for reusing plastic bags? Get 'em here.