Enough Soil?

whats up guys? well I was unsuccessful at my first attempt to grow from bagseed. so I made some upgrades to my grow box, and ordered some Lowryder 2 seeds. I saw pictures of guys growing in a big gulp cup, and it looks like I'll be able to fit 8 big gulps in my grow box perfectly. but is this enough soil? Would I get better results if I grew 6 plants at a time with larger containers? I appreciate any input...

well when your plants get bigger they will need alot more soil. for sure. personally i use like a big bucket or pail when my plants are like just about a foot high.
http://youtube.com/watch?v=VleOXtPBgA4
that video will show you what im talking about. half way into that video they show the 16 litre containers they use to grow some K2. thats a good video. its in like 5 parts on there though i think.

hope that helps