The body has warned that the cost of retailers implementing the ban on displays has been severely underestimated.
In its response to government consultation on the legislation, the body claimed the cost of installing flaps over existing gantries would be around £1,840 per store. Government estimates are between £210 and £850.
ACS chief executive James Lowman said: “We have also found the proposal would cause significant problems for staff in the daily activities of serving customers and restocking.
“The slowing of service times will harm customers and the cost? of the ban would continue to grow over time.”