How do you store your cat/dogs dry food? I have two cat food containers that are plastic but with all the cat food I've been getting for free lately both have been filled to the brim all the time. The new dog food I got free doesn't have a little zipper closure like his Royal Canine food does and also is a paper bag vs a more plastic bag so my cat can easily rip through it if she gets in the cabinet. My cat is the master and getting to food and ripping open bags so I'm trying to avoid that. I'm thinking maybe some sort of rubbermaid/tupperware container but those brands are so expensive.. what else is out there I could get relatively cheap and would keep the food fresh?