I'll admit, not a fan, but have these questions.

1. What happens when you fall forward onto the RIBZ?
Both to your stuff and you. It looks like it would be painful.

2. Is there backing on the pockets to allow for airflow?

Looks to me like you are replacing one item (Camelback daypack) with two items, the Ribz and the Camelback w/o storage.

I think I'll stick with my C'back daypack.