Look on Youtube. A guy in Ireland who goes by the name baconsoda grows potatoes in bags and gets very nice harvests. I think about seven gallons is as small as I'd go - five is a squeeze. Look at grow bags sold for use with potatoes to get an idea of the sizes they offer.

I don't know much about the burlap bag method, but if you have 3 months left of growing season, you can gro 'em.

Likewise I have never planted sweet potatoes in a container or bags. But have seen pictures of those who have and they just let the vines spread out over them and down to the ground. And from the reports I've read they produce well. Production is very hard to predict. Weather conditions can cause production to change a lot. The same varieties I dug up to nine pounds in 010 from didn't produce a pound after the hail and the hot, droughty summer last year. And the one I planted in mid July produced several tubers but none as large as the one they were produced from. I would say the most I dug last season was around 5 pounds. The same variety that produced nine pounds the year before. So very hard to predict. And then again growing in a bag, container may affect production also. Jay

OK, you caught my attention on this one. I actually thought I would plant one per bag, 20 bags - I usually plant - 20 in-ground plants and it is enough for us for all summer long - we just finished our last potatoes 2 days ago. So do you think planting like 3-4 potatoes in a large bag is more productive than plant one in a smaller one? In the ground, I plant them 1 foot apart, but they have about 3 feet - my bed width - in other direction, and I pick some potatoes right at the edge of the bed... The problem is, I am not sure I can find 3 feet wide space for the large bags. If I have it, it would be already a bed, ha-ha). So in your opinion, what size of the bag and number of potatoes in it will give results closer to in-ground production keeping in mind size limitation of max 2 feet in width per bag?