Starting Thursday, Cinemark will ban bags or packages larger than 12x12x6 from its theaters. According to Cinemark's website, the move is “in an effort to enhance the safety and security of our guests and employees.” The theaters will make exceptions for diaper bags and medical equipment bags. In Las Vegas, Cinemark operates theaters at The Orleans, Sam’s Town, Santa Fe Station, South Point and Suncoast as well as the Cinedome in Henderson.