How to trigger rules action if cart is empty? We have a field in our user profiles that is checkmarked when a user adds a product to their shopping cart (with Drupal Commerce). This is used to display a message reminding them to checkout if they have items in their cart. I have successfully set up rules to check the field when they add a product, and uncheck it when they make it through checkout. 

However, I also need to uncheck the field if a user removes all products from their cart. I can't seem to figure out what conditions to add to check if the user's cart is empty after a product has been removed.

Any suggestions?
You could try adding a rule that looks at the total number of items in the cart. Just get the count of the line items list within rules.