When to transplant from 9oz solo cups?

[exploziv]

Great job! They are clearly happy and growing fast!

 

[GoonWithAGrow]

Hey guys today is day 15 for my seedlings. Currently in 9oz solo cups(some only half filled). I can see roots at the drainage holes so I'm guessing they are ready to transplant. My question is should I transplant into 18oz solo cups or should I go straight into the 1 gallon rain science grow bags that I will be flowering in?
Thanks dudes!

Are these autos? They look great