Louse76 - One 3.5 lb bag literally last the entire month for my one cat. She only eats 1/2 cup per day. I had 5 coupons for $1.50 off and bought 5 bags. I'm finally on my last bag which should be finished by the end of June. That's 17.5 lbs of food since the beginning of February. I do keep her food in a heavy duty plastic container which can hold up to 10.5 lbs of dry food. I know they sell 7 lb bags according to Purina ONE's website, but I have yet to find them in stores. I can only find 3.5 lb or 16 lb bags.