Assuming you have a large enough home, the best place to store your diaper stockpile is in a cool, dark, and dry basement or closet. If you live in an apartment or smaller home, any out-of-the-way spot will do, as long as it meets the cool, dark, and dry requirements. An unheated garage or spare bedroom are both good possibilities. Once you've selected a location, make sure to keep your stockpile organized so you can easily find the size and brand of diaper you need when it's time to change a dirty one.