You should never store onions and potatoes in the same bin/container. it's easy to do because you don't refrigerate both but, they cause each other to go bad.
Also storing veggies in their "store" bags in the refrigerator also makes them have a shorter life as well. Instead take them out, put them in the vegetable crisper, add a paper towel to the bottom of the drawer that you replace often. It will absorb the moisture that causes them to spoil.
