Grow bags to use

Grow Support Autoflowers
1

So I have 15 gallon bags but they seem a little big for indoor grow, what size for auto flowers are best ,also do you water until it flows out if not how to rinse soil out

2

I use 3 to 5 gal i found that air pots work best for me they give great growth.

3

Same here 3-5 gallon