Generally, when considering what size pot to use, you're thinking in terms of gallons. I know my plants (approx 2ft tall each) loved the ample size of my 3 gal. pots I used last time. However, I was thinking I could maximize the space, and possibly add another plant or two into my flowering space by using square pots this time. When just browsing through websites for availability and pricing of square pots I noticed like some other circular pots, their sizes where given in inches. Actually, I notice most of the time pots are listed in inches. Are these inches sizes fairly consistent with their room (cubic feet/gallons/etc) from brand to brand? For example I saw some square pots listed as 7.5 inches for the biggest size square pots that particular company sold. Anyone have a guess on the room inside these 7.5 inch square pots?