Using a flat bar hybrid/gravel bike for hauling?
Hello, recently I've been looking into buying a bike and I came to the conclusion that I would most likely be looking at a flat bar hybrid/gravel bike. I would be using it for mostly road, but also some light gravel/dirt trails/paths in a wet, hilly area. However, something I didn't consider until now was that I'd also be possibly using it for grocery runs and I'd like to know if this sort of bike with an aluminum frame and rear racks with panniers would be strong enough to haul at least 40 lbs, of course assuming the rear rack is rated for such weight? Or should I be looking at a touring bike or a bike with a steel frame?
Thanks.