While some politicians posture in public to the contrary, “fanny pack carry” is legal in Illinois.
Here is Illinois law explained, directly from “Transport Your Firearm Legally”:
HOW CAN I LEGALLY TRANSPORT A FIREARM ON MY PERSON OR IN MY SPORTS UTILITY VEHICLE (SUV), PICKUP TRUCK, VAN, STATION WAGON, OR EVEN A MOTORCYCLE?
Three statutory codes regulate the possession, transfer, and transportation of firearms – the Criminal Code, the Wildlife Code, and the Firearm Owner’s Identification Act. In order to comply with those statutes when transporting a firearm, it must be:
Enclosed in a case, and
By persons who have a valid FOID card.
HOW CAN I LEGALLY TRANSPORT OR POSSESS AMMUNITION?
Illinois law requires residents possessing ammunition have a valid FOID card. The location of ammunition being transported, including ammunition being transported in loaded magazines, is not regulated if the firearm is possessed or transported lawfully.
IS IT LEGAL TO HAVE AMMUNITION IN THE CASE WITH THE FIREARM?
Yes, as long as the firearm is unloaded and properly enclosed in a case.