Line a baking sheet with aluminum foil and place it on the lower rack of your oven (to catch any leaks from the potatoes while baking). (emilybites.com)
They are also handy for sticking in your nursing bra as a way to catch leaking milk from your «free» breast when you don't have a breast pad to hand. (expressing-mama.com)
I'll admit, I just slap an overnight pad in my underwear to catch any leaks until I wake up in the morning. (clothdiaperaddicts.com)