Yea, they have clip-ons that work with the OEM rack, but putting one backpack in crate may be what I end up doing. I have a limited budget, so I gotta get what I can afford.. I know crate holds the weight up higher, but with it there's no need for me to bend down or even really lean forward. After 20 years and numerous crashes, my knees & back like to be straight, I even often stand when riding transit.

Between Craigslist, a few local vendors, and freecycle I may end up with a larger cargo basket that extends back (rectangle) attached to the OEM rack, with room enough for both backpacks, or whatever else. Seeing as though I ride in traffic, I gotta watch the width of anything I add on especially at curb height.