This is my grocery shopping setup (you can just see the corner of the bin that I bungee onto the trailer).

A new set of Wald rear baskets and a 25-year-old Wald front basket. I used wire shelving to make the lids for the rear. It makes them lockable and gives me nice, big, flat area to strap down a bag of dog food, cat litter or multi-pack of toilet paper.