The phrase "bag fee" refers to a charge or extra payment that is required when you want to use or obtain a bag, usually at a store or a specific location.
Supporters of the plastic bag fee say it's designed to cut down on environmentally harmful waste and surcharges in other cities have worked better than outright bans. (nystateofpolitics.com)
I didn't like that I paid almost $ 100 on bag fees for one basically empty check bag. (kayak.sg)
First and second bag fee waivers for you and one companion. (thepointsguy.com)