Ziplock bags can be purchased in different sizes. Small sizes have a capacity of 1 liter, medium sizes have a capacity of 3-4 liters, and large sizes have a capacity of 6-7 liters. Additionally, some brands also produce ziplock bags in larger sizes. Ziplock bags are equivalent in size to regular bags, so they can fit more items and take up less space. It is a practical and easy solution to choose and use ziplock bags of appropriate size according to your needs.