Most Ziploc freezer/storage large bags are offered in standard gallon capacities (commonly 1 gallon and 2 gallon). In addition, some extra-large flexible tote-style options are listed with a 10-gallon capacity.
Listings show two common closure types: double-seal/double-zipper locks (described as "Double Seal Lock" or "Secure Double Zipper") and slider/slide-style closures (marked as "Slider" or "Slide Zip").