I was curious on what size cloth bags should be using ,
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It depends on what you are doing. Autos vs photos. Coco vs peat vs soil…indoor vs outdoor. One plant or multiple plants…how big do you want them to get.
I grow 4 or 5 plants indoors and use 7-gallon or 5-gallon grow bags using a peat based medium. Outside I soil and have used as small as 7-gallon bags and as big as 45-gallon bags.
Let us know a little bit more about your grow and others will chime in.
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Outdoor I have had really good luck with 10-gallon fabric bags with soil. They definitely got bigger than the ones that I had in the 5-gallon bags. That said, there is a Solo Cup Grow Challenge going on right now in the forums if you search for it. It’s amazing what can be done. But you have to be willing and able to water twice daily sometimes or more.
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I do Autopots and when I use fabric pots I go with 3 gallon.
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I like 20 gallon fabric pots. I add medium size river rocks to the bottom to keep them from tipping over from tall plants and wind… I would go to 100 gallon pots if I had room for trees!
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Indoors? I prefer 2- and 3-gallon bags.
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It’s not just the 100 gallon fabric pots, but then you also have to build the huge support structures needed for those big-bud trees…lol I had to put block wall bricks on my 6-inch net pots for my hydroponic tote growth. It’s kept trying to fall over when “Audrey” from the GFOG Community Grow got too big. Warped the hell out of the net pot and the tote lid.
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My GFOG plants were monsters even with doing LST every other node. Great bud but difficult to keep under fence lines… imagine GFOG in 100 gallon fabric pots! Wish I had the room.
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We will be rocking the 200 gallon fabric pots this next year for the outdoor grow. Bigger roots = Bigger fruits. 
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Hope you have plenty of room, no neighbors nearby and are planning a means of support as well to prevent toppling. Should be monsters!
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7 gallon fabric bags for all my indoor grows for now on. Plants seem to like it better than regular planters for sure. Only problem I have is with run off.
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3-7gal indoors, 10-15gal outdoors. 1 bag per plant. Larger the bag tends to lead to larger plants as they grow as far as their roots let them.
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