Has anyone tried storing bulk fertilizer in grain storage bags?

With fertilizer prices as they are, I am looking for a way to take advantage of a near wholesale fertilizer buying opportunity. But, I need a place to store it until the ground thaws sometime in March. My particular situation is such that I have limited interior building space and essentially none with concrete flooring. But, I do have a concrete bunker that we haven't used since getting out of the cattle biz years ago. Just thinking... Has anyone tried putting fertilizer in those grain storage bags? Your results?

I'm having nightmares about the whole thing turning into one big brick.