I also use the HD Homer buckets with the gamma lids for my grain. It's about $9-10 for each bucket/lid set if you go this route.
55 lbs of two row fills two 5 gallon buckets to the brim. I also have 55 lbs bags of Pilsner and Wheat, and I forget which one (I think it's the wheat) takes up more space and doesn't quite fit into two buckets, so I just throw the extra 1/2 lb or so into a large ziplock bag until I use it.
Definitely, if you use those totes, don't just dump the grain in there. There are only two things that can really ruin grain quickly, moisture and bugs, and the tote just by itself doesn't really protect against either one. You really need to store grain in airtight containers.