For checked baggage in 2026, there is no standardized "100ml" limit like there is for carry-on luggage, but certain volume and safety restrictions apply. Most airlines allow you to pack as much liquid (shampoo, wine, lotion) as you wish, provided it fits within your weight allowance and is securely sealed to prevent leaks. However, for alcoholic beverages, there are specific rules: drinks with 24% to 70% alcohol are usually limited to 5 liters total per passenger, and they must be in their original retail packaging. Liquids with more than 70% alcohol are strictly prohibited. For toiletries and aerosols (like hairspray or disinfectant), you are typically allowed up to 2 liters total, with no single container exceeding 0.5 liters. For 2026 travelers, it is a "best practice" to double-bag liquids and leave roughly 5% of the bottle empty to account for pressure changes, which prevents "shampoo explosions" from ruining the rest of your clothing during transit.