35 Miss. Code R. § 2-02-05-106
No on-premises permittee shall allow alcoholic beverages to be brown-bagged by a consumer/customer on the permitted premises. However, this restriction does not apply to privately leased banquet rooms or privately leased hospitality suites. If a private banquet room or hospitality suite is leased to an individual and said individual desires to bring his own alcoholic beverages (brown-bagging), the permittee is strictly prohibited from providing or serving alcoholic beverage inside the lease area. On Sundays, when the Department specifically authorizes consumption as described above, a consumer may ONLY brown-bag alcoholic beverages previously obtained from a package retailer in the State. All alcoholic beverages remaining in a leased banquet room or hospitality suite after the expiration of the lease shall be destroyed by the permittee.
35 Miss. Code. R. § 2-02-05-106