The TSA regulations covering wine for checked and carry-on luggage

According to the TSA website, you can bring wine and spirits in your checked luggage. If the alcohol by volume (ABV) is below 24% or 48 proof (most wines are under 20%), you can pack as many as you want (just remember that extra baggage fees may apply). For spirits with an ABV between 24% and 70% (48 to 140 proof), you can check them, but you're limited to five liters per person. These spirits must remain unopened and in their original labeled bottles. However, spirits with an ABV over 70% cannot be checked, so you won't be able to bring the strongest alcohol in the world on the plane.
The rules for carry-on luggage are more stringent. You can bring unopened mini bottles (under 100ml) in a clear plastic bag. However, there's a catch: while you can carry them on, consuming them during the flight is prohibited and can result in hefty fines (up to $40,000). Even non-alcoholic mini bottles are not allowed for in-flight drinking, and full-sized non-alcoholic wine bottles must be placed in checked luggage.
Lastly, be sure to check with your airline for any additional rules. For instance, Southwest Airlines requires that you use dedicated corrugated cardboard packaging to protect each bottle. These can be purchased online or at Southwest ticket counters for $5 each (subject to availability). On the other hand, Emirates does not impose specific size restrictions for carry-on bottles, but they are subject to the customs regulations and airport security checks of your departure or arrival country.
Here is the best way to pack wine in your checked luggage

The simplest approach is to wrap wine bottles in clothing or towels. You can slide a bottle into the sleeve of a sweater or the leg of a pair of pants, then wrap the fabric around the bottle. Nestle it among other clothes for added protection. When using towels, wrap the bottles like a burrito. Make sure to avoid direct contact with the sides of your luggage, and refrain from packing any valuable items that could be damaged if a bottle breaks.
An even better option is to use cardboard or inflated plastic packaging specifically designed for bottles. Pulp wine shippers are a great way to safeguard the bottles, and they are compostable as well. These can be ordered online, and some liquor stores offer travel packaging. If you frequently travel with wine, consider investing in a specialized wine suitcase designed for storing and transporting bottles. A large bag can hold up to 12 bottles or an entire case of your favorite Sonoma selection.
Lastly, any items purchased at a duty-free store come pre-packaged and should remain in their original packaging with the receipt attached. These items can typically be carried on board and will be stored by the flight crew in a designated area. It's important to note that you are not permitted to open or consume them during the flight, but they are perfect for a celebratory toast upon arrival. Remember to let the wines in your suitcase rest for a few days to prevent bottle shock, which can occur during travel.
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