I plan on buying more pellets for my two piggies before the month is out. I am currently debating if I should buy the 5lb or 10lb bag. I estimate a 5lb bag will last me about 6 weeks and a 10lb bag would last 3 months. Buying a bigger bag certainly would save me a few dollars, but I'm not sure if 3 months is too long to keep a bag of open pellets. How often do you all buy pellets for your piggies?