I believe they are 6 gallon. You can get bigger ones and have two plants per pot without issues though. I'll double check the container sizes tomorrow in the daylight and let you know. Just make sure you mix a lot of perlite in with whatever potting mix you use so the roots get really good drainage and can breathe. Some compost in there is also good, preferably cow not chicken if you have the choice. This will help with slow release nutes to give the plants stuff to snack on between feedings down the road as well as promoting good microbial health in the soil. Which can help the plant fight off disease and such, which Epsom salt also helps with in addition to helping flowers set fruit.