All of us want to buy bigger bigs of kibbles for the savings, but how do you store them when it will last something like 6mths? Airtight container apparently is still not all that safe, cos kibbles will still be exposed to that little oxygen inside the container. What about vacuum sealing, which is the best way of keeping, but the cost of the bag alone is high, defeats the purpose of buying kibbles in bigger bag. Is refrigeration a good idea? How do you store yours?