Pizza is the king of foods for many reasons, but the fact that leftovers are almost guaranteed is one of the best. For retaining optimum quality — and taking up as little space as possible — use this method.
Jeremy Anderberg at The Art of Manliness notes that most of us -- myself included -- just throw the entire pizza box into the fridge with whatever is left inside. Instead, Anderberg suggests grabbing a plate and stacking the pizza slices one on top of another. In between each piece, place a paper towel, and when it's all stacked up, cover it in plastic wrap.
This will ensure the pizza stays fresh and is on its best behaviour when it comes time to reheat it..
The Best Way to Reheat Pizza [The Art of Manliness]