I plan to switch to Purina's SunFresh Start & Grow as soon as I finish up the chick starter that I have. I like the fact that it's an all-natural (no animal by-products) feed. Also, I'll have to drive almost an hour to the closest Purina dealer, so I plan to buy alot at one time, if it comes in 50 lb. bags, then I'll buy 2 or 3. So I'm wondering if keeping it in a metal trash can with a tight fitting lid would keep it fresh enough.