Top Pop Seltzers that are Kosher for Passover [product_category category=”Kosher-for-Passover”] Top Pop Soda, an ultimate American pop. Classically, refreshing.. Naturally sweetened. Naturally flavored. This product does NOT contain high fructose corn syrup. Fat free. Gluten free. Very low in sodium. Kosher. Sold as 6 pack or 10 pack.