A standard 1-quart (32 oz) Ziploc or storage bag typically measures 7 inches by 8 inches (17.7 cm x 20.3 cm). This specific size is significant for travelers because it is the maximum dimensions allowed by the TSA and other global aviation authorities for the "3-1-1" liquids rule. While some generic brands might vary slightly (such as 7" x 7.75"), the volume remains the same. A quart-sized bag is designed to be large enough to hold several travel-sized containers (3.4 oz or less) but small enough to be easily inspected at security. If you use a larger "gallon" bag or a non-transparent bag, security may ask you to transfer your items or dispose of them. In 2026, many frequent flyers have transitioned to reusable, clear silicone bags that adhere to these 7" x 8" dimensions, as they are more durable and environmentally friendly than disposable plastic bags while still meeting the strict "transparent quart-sized" requirement for carry-on liquids.