1604.14.30.91 - In foil or other flexible con- tainers weighing with their contents not more than 6.8 kg each

This HTS code, 1604.14.30.91, specifically classifies prepared or preserved tuna and skipjack tuna that are not minced, are packed in airtight containers, and are not packed in oil. The defining characteristic of this subcategory is their packaging: they are presented in foil or other flexible containers, with each individual container weighing no more than 6.8 kg along with its contents. This packaging method distinguishes them from tuna packed in rigid metal cans or other more traditional forms of airtight containers.

The distinction from its sibling category, 1604.14.30.99, lies precisely in the type of flexible packaging. While both are "Other" within the broader category of tuna and skipjack not in oil and not minced, 1604.14.30.91 is exclusively for those in flexible foil or similar containers weighing up to 6.8 kg. The sibling category would encompass other forms of packing or preparations not meeting this specific flexible packaging criterion. As this is a leaf node, there are no further subcategories. This classification is the most granular for tuna and skipjack presented in specific flexible packaging formats.