As someone with expertise in both wine and beer, I can certainly provide you with a detailed answer to your question regarding carrying duty-free alcohol in hand luggage in the USA.
Firstly, it is important to note that there are restrictions on bringing alcohol into the United States, particularly when it comes to the quantity and packaging. You mentioned that you are limited to 5 liters of alcohol between 24%-70% ABV or 48-140 proof. This is a relatively generous allowance, as it allows for a decent amount of alcohol to be brought in for personal use.
However, there is a specific requirement for the packaging of the alcohol. The bottles must be packed in a transparent, secure, tamper-evident bag by the retailer. This is to ensure that the alcohol has not been tampered with or opened during transit. It also allows for easy inspection by security personnel if necessary.
This requirement is in place to maintain the integrity and safety of the alcohol being transported. It is important that the packaging is transparent so that the contents of the bag can be easily identified. The bag should also be secure and tamper-evident to prevent any unauthorized access to the alcohol.
In my personal experience, I have traveled with duty-free alcohol in hand luggage on numerous occasions. I have found that most duty-free shops are aware of the packaging requirements and will provide you with the appropriate bag for your alcohol purchase. It is a good idea to double-check with the retailer to ensure that the bag meets the necessary criteria.
When traveling with duty-free alcohol, it is also worth noting that there may be additional restrictions or requirements when it comes to your connecting flight. Different countries and airlines may have their own rules and regulations regarding the transportation of alcohol. It is always a good idea to check with your airline or consult their website for specific guidelines.
You can carry duty-free alcohol in your hand luggage in the USA as long as the bottles are packed in a transparent, secure, tamper-evident bag by the retailer. It is important to adhere to these packaging requirements to ensure a smooth and hassle-free travel experience.