I'm not sure what size they are, dumb as that sounds, and at this point I can't exactly turn 'em over to look. Not sure anything's written on the bottom anyway.
I have two very large containers, and a bunch more that are the next side down. I do know that the largest will accommodate one forty-pound bag of potting soil. I think the next-largest hold about 30 pounds. I wouldn't recommend anything smaller than that. You need an incredible amount of potting soil the first year, but after that you can just top it off. Fortunately my supermarket delivers, so I don't have to do all the lugging myself.
I'd suggest that you order your peppas from these people:
I've been buying from them for two years now, and I'm a very big fan. Their plants are healty, strong, and get even bigger than they say they will. AND their selection is second to none. They also sell tomato plants, and they have excellent organic fertilizer.
Today my first Trinidad Perfume ripened. Last night it was green, now it's bright yellow. Maybe not quite fully ripe, but it will be by tomorrow. And it's supposed to be late season, so it's producing much earlier than expected.