In a unanimous vote Wednesday, the Board of Commissioners in Wildwood approved an ordinance amendment banning backpacks and other bags larger than 8 inches from the beaches and Boardwalk after 8 p.m., a move officials say was prompted by rowdy teens who disrupted Memorial Day weekend.Citing emergency powers, city attorney Steve Morris said the ban would go into effect immediately and would not require a second vote, which is when there is normally a public hearing.