Since my curls don't go all the way up on their own, rinsing upside down alone will not give me extra volume.
My fool proof trick:
When I get out of the shower, I flip my head over and rake in product. Then I gather my hair in a scrunching motion til I make a big ball at the top of my head and I secure it w/ a band or clip. I lightly shake it out about 20 minute later, and TRY not to touch it until it finshes drying. Tons of volume at the roots.