This is what Nittany says about their frame bag:

There's a great many half/ partial framebags on the market, though many limit the ability to run multiple water bottles or other bags because of fixed mounting points and excessive depth. Fully customizable mounting points around the entire outside of the bag allows for numerous fits and for additional gear to be stowed below the bag. This is the perfect bag for long single day rides or warm weather multi-day endeavors.