A tip for all you folks - Ziploc makes 3 gallon, 5 gallon, and 20 gallon storage bags that work awesome for brining. I use 3 & 5 primarily, but have used a 20 gallon for doing two 15 lb. turkeys at the same time! I put the turkeys and the brine in the ziploc, then put the bag in a big 48 gallon ice chest, and top it off with a 20 lb. bag of ice. It can sit in the garage for 24 hrs. no problem, the ice doesn't dilute the brine, I don't have to try and find room in the fridge for a big bucket, and when I take it out the cooler is still clean since all the turkey juice and brine was sealed in the bag.
And these are super heavy duty bags, probably about 3-4 times thicker than a reg ziploc, with two sealing strips.