Are there bag carrying solutions for crabbon road bikes that don't entail spending $1500 on a "system" made with proprietary bag clips and exotic aerodynamic hi-mod superalloy nonsense? But not so clunky as a cargo bike platform that weighs 15 pounds for the rack alone?

I'm not really a "bikepacker" but it would be nice to have some options for modest carrying capacity without getting a whole other bike or turning my bike into a garbage barge