No, a standard "Medium" Ziploc bag is typically a Quart size (7" x 8"), but you must be careful with the nomenclature used by various brands in 2026. While Ziploc specifically labels their mid-sized bags as "Quart," some generic brands may label a slightly larger Sandwich bag (6.5" x 5.5") as "Medium," which is actually smaller than a quart. For TSA "3-1-1" liquids compliance, the bag must be a true quart-sized bag, which has a volume of approximately 57.75 cubic inches. A standard 7-inch by 8-inch Ziploc Quart bag is the "gold standard" for airport security and is universally accepted. If you use a "Gallon" bag (which some might mistakenly call "large/medium"), it will likely be rejected at the checkpoint if it contains liquids. In 2026, many frequent flyers have transitioned to reusable, clear, silicone "TSA-Approved" toiletry bags that are exactly one quart in volume; these are more durable than Ziploc bags and help avoid the ambiguity of "small vs. medium" branding, ensuring you never have to toss out your expensive skincare products because of a sizing misunderstanding.