2 gallons of soil enough to flower?(pics)

Ive got these six ladies in 2 gallon containers vegging in lst and i can see the roots starting to grow through the holes in the bottom of the container. If I started to flower within a week do you think these containers will be good enough to the end of flower? what will happen if they start to flower and get root bound? Ive already transplanted once and I dont want to again. Here are some pics

lookin good, i think youll be fine, i believe i got 3 gallons, they are 12"

intrin said:

lookin good, i think youll be fine, i believe i got 3 gallons, they are 12"

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I wish i would have just transplanted into 3 gallons the first time but space constraints wouldnt allow. I dont think im going to risk having them get root bound during flowering. I bought some cheap 3 gal paint buckets at lowes today. As soon as I get some soil and before i start flowering Im going to transplant.