I agree with robow, the Ortlieg Front Rollers are relatively small. This picture gives you a sense of scale compared to the sie of the rrear panniers.
My wife rode across the U.S. using a set of Ortlieb rear panniers and a rack pack for her camping gear. She used Orlieb Packer Plus bags which are a little larger than the Front Rollers.
What are using the "small" front bags for?