Try to look at the bottom of the black containers, there should be a number like 400, 600, 900, 1200, etc. the #s preceeding the zeros are the # of trade quarts I think. So a 900 = 9 qts, 1200 = 3 gallon, etc.
I've grown peppers in containers as small as 2 gallons if fed regularly & watered daily, sometimes 2x. Of course, bigger is better, but I've been growing my peppers in 4-gallon kitty litter type square buckets, usually only 3/4 full.
Hope this helps.
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