This is actually a good lesson in communication.

Question 1, are you fine with the chicken in with the bread? Question 2, would you like the drain cleaner left separate rather than with the food items.

They either don't care or would suggest leaving the bread or chicken separate, same for the drain cleaner.

The worst grief you'll get is why they can't have 3 bags.

This is obviously a three-bag situation, who would want to have these items packed any other way?