I have the Home Depot white ones, and you're exactly right on that 7gal white Viagrow plastic, being a 5gal size. Even their stated dimension says it, 14 x 8.5 x 10 inches, divided by 231 cu in gal, = 5.15
The grey root pouch fabrics are off about the same, the 10's are 8gal, the 5's are 4gal
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