When you’re finished using your mattress, deflate it according to the manufacturer’s instructions. Make sure all the air is out of it, as it’s more prone to damage while inflated. Fold the long sides of the mattress in toward the middle. Then either fold it in half or quarters or roll it up. Place it in its box or storage bag before stashing it in a closet or on a shelf. If you can’t find the box or bag, wrap it in a towel to protect it.