comments:
Theoiscool posted on r/bikecommuting2w
Years ago, I bought one of these https://a.co/d/0beMkNwG and something similar would carry what you’re describing. Big bags fit better on my old ebike than on a normal bike rack. But one thing that holds a lot on my normal bike rack now is this Specialized coolcave bucket. https://www.performancebike.com/specialized-coolcave-pannier-black-single-19l-41122-6000/p1477993 But there are cheaper options.