If your laundry room has your dryer -- I wouldn't recommend it.
I use 5 gal containers with lids -- I can fit 1 40# bag into 2 with a little left over.... The lids will keep the grain out of harms way, but you need to still consider excess humidity where they are.
I found that not buying more than I need for a week was the best way to not have so much on hand that it's a storage problem.
Good you were paying attention to the grain being abnormal. If it's moldy, fermented, don't feed it to them. They WILL eat it!