The standard dimensions for a Ziploc brand medium freezer bag are 7 inches by 7 7/16 inches (approximately 17.7 cm by 18.8 cm). These bags are often referred to as "quart size" in the United States, as they have a volume capacity of exactly one quart (0.94 liters). Specifically designed for freezer use, these bags feature a much thicker plastic than the "storage" or "sandwich" versions to protect food against freezer burn and to prevent punctures from frozen edges. They also utilize "Grip 'n Seal" technology, which includes a textured tab at the top for easier opening and a double-zipper seal that provides a tactile and audible "click" when closed. For travelers, these bags are a favorite because they are nearly the exact size required for the TSA "3-1-1" liquids rule (which mandates a quart-sized clear bag). Whether you are portioning out meat for long-term storage or organizing your carry-on toiletries, the 7" x 7" format has become the industry standard for medium-capacity, heavy-duty resealable plastic bags across North America.