Well, it depends on how much you want to cram them in there. I have a tent w/ the exact same dimensions you are describing. I can get about 25 2 gallon pots in there, in addition to 2 5 gallon buckets, and a couple of 6 inch square pots w/ some wiggle room. Not much, just that round pots don't use that space efficiently as it could be used. 2 gallon grow bags seem perfect, and you could get more in there using them. Just remember you need room to work too. You also need to be able to get to them, for watering etc...
If you are like me, you probably will have to take them out to water and then put them back, which is fine, it gets them rotated a bit, just takes lots of time. Hell you could probably get away with twice as many 1 gallon bags, (yes I know, "thank you capt. obvious" lol) just a little voice in my head tells me 2 is a little safer. But again that probably depends on how well established you get your clones before you flip them. I would rather end up w/ a little too much room for roots, than not enough. If you are going to flower as soon as they root, then the 1's are probably fine, your plants won't get that big, but SOG is about numbers, not big plants. It's all new to me, and I am not exactly doing a SOG at the moment, but it is intriguing. Hope that helps. Take anything I say w/ a grain of salt please, I am still figuring out my ass from the back of my hand when it comes to growing, but thought I would chime in since I have had some experience with this specifically.:jointsmile: