Pet food quantity - large package or small package?

I buy food in different sizes depending on what species I'm feeding. My horse goes through approx. 25lbs of grass hay/alfalfa. 1lb of beet pulb and 1lb of rice bran a day. All of these are bought in bulk and hay is brought in by the ton. Although, for my rabbit, hay is bought in small, packaged pounds.

Feeder crickets for the frogs are bought in relativity small and frequent quantities because they don't have a very long lifespan, and I only go through two a night, one for each frog daily. Cat and dog food is bought in medium sized bags. The hermit crabs, crickets, and tortoise all get their meals fresh prepared at home.