Automatically assign category and group by category in item list
An alphabetic list of items is useless when I'm shopping in the grocery store because most stores are organized by category not by alphabet.
Many list apps come pre-packaged with categories so when you add an item it gets tagged with the category automatically. For example, when entering "Advil" the app automatically puts it into the "Health and Personal Care" category. It puts "blueberry yogurt" into the "Dairy" category. Then when I'm shopping, I just go category by category in the store.
I like this idea but have worked around it for now using the store field. Instead of having different stores, I've used the field to mark an isle in the grocery store. For instance I have a store called Produce and another called snacks/crackers. I put each item in the cart in different stores. It works for now.