Did you ever think there'd be a day when you discovered your pantyhose actually have two functions? The first is protecting your legs in cold weather (or covering up your legs in general), and the other...keeping onions fresh! Keep them at room temperature, and store in a cool, dark, dry place with proper air circulation. Hanging wire mesh nets are handy for this, but if you don't have any, you can resort to unworn pantyhose. Check out the trick here.