Is a large Ziploc bag a gallon?

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TSA Isn't Very Strict About Quart Size Bags
You'll only encounter problems if your toiletry bag looks way too large or if you encounter a very strict officer, but this happens rarely. If you always carry a 1-quart backup Ziploc bag, then you can use a 1.5-2 quart reusable toiletry bag.

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What TSA wants is a bag that is the approximate dimension of a quart-size bag and is clear. That means that a ziploc bag from the grocery store works just fine as long as it is not larger than one quart.

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Ziploc® Gallon Freezer Bags - Large Size - 3.79 L Capacity - 2.70 mil (69 Micron) Thickness - Multi - 14/Box - Food, Meat, Poultry, Soup, Seafood.

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It says on the TSA website that all 3 oz. liquids must be in a quart size baggie, not a little fold over sandwich baggie and not a gallon size baggie.

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Is toothpaste considered a liquid by the TSA? Yes, toothpaste must adhere to the 3-1-1 rule for liquids and gels. Toothpaste can be brought through TSA security in your carry-on as long as it is 3.4 ounces (100 milliliters) or less and placed in a 1-quart bag.

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However, when packed in carry-on bags, makeup in a liquid, lotion, gel, paste or creamy form, must be in containers that are 3.4 ounces or less. You can take as many travel-sized liquids as you can comfortably fit into one quart-sized, zip-top bag. One liquids bag is allowed per passenger in carry-on bags.

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