I like to vacuum seal my hops- whole hops especially. Specialty grain too. Everything goes into a chest freezer. I think the Foodsaver brand vac-sealer is the best.
Bulk grain goes into gallon freezer bags- they hold 5 pounds. Then my base grain is used in 5# increments for recipes. These can go into a paper bag, bucket, box... just as long as they stay dry and cool.