For Farmer's Mkt runs on my town bike I carry veg in an old Kirtland handlebar bag which has a few sheets of thin bubble wrap cut to fit as spacers. By design the HB bag is well insulated from road shocks, never had a bruised tomato or beat-up berries in years of use. Free range chicken goes double freezer bagged with sturdy stuff in the classic British seatbag to prevent cross contamination.

-Bandera