But maybe you (and millions of others) need a single “Pannier/Tailbox” , which combines the top basket with the side panniers...



Deeper Panniers require a cut-out to prevent hee-strike.

M320 Pannier/Tailbox



Just a suggestion.

I’m waiting for industry to catch up. For now, it’s a DIY Project. You can buy corrugated plastic at Home Depot.



The M320 has 12° of taper for aerodynamic advantage.

This is a 16” cube, a standard size.