Help with vac chamber

Hello everyone, I tend to stay in the shadows but I have a question. For doing runs of BHO with around 1-2oz of starting material, what size chamber would be ideal? I plan on purchasing a 7cfm pump to go with it. Thank you gr any advice!

all of them will work... but i would get a big one because you will want to upgrade in the future

I use a 3 gal. Vacit Pro and a $80 ebay 3cfm pump. Works great.

Thanks guys, I appreciate the advice!