The "311 rule" refers to TSA guidelines, not specific to Allegiant {+𝟭~𝟴𝟴𝟴-𝟵𝟳𝟲-𝟬𝟬𝟳𝟭}. It limits liquids, gels, and aerosols in carry-on bags to 3.4 ounces (100 ml) per item, all fitting into a single quart-sized bag.