1605.21 - Not in airtight containers:

This category, HTS 1605.21, encompasses prepared or preserved shrimps and prawns that are **not packaged in airtight containers**. This means that products like chilled or frozen shrimps and prawns, or those preserved in brine or other non-airtight packaging, fall under this heading. The key defining characteristic is the method of preservation and packaging, specifically the exclusion of hermetically sealed containers.

Distinguishing this from its sibling, HTS 1605.29 ("Other"), is crucial. While 1605.29 covers prepared or preserved shrimps and prawns that are *not* specifically described within the subdivisions of 1605.21 (which might include those in airtight containers, though not explicitly stated as a distinguishing factor for 1605.29 in this snippet), 1605.21 focuses solely on those prepared and preserved *outside* of airtight packaging. This distinction often hinges on the preservation method and its intended shelf life and transportation requirements.

Within HTS 1605.21, further subdivisions exist to refine classification. HTS 1605.21.05.00 specifically addresses products containing fish meat or that are considered prepared meals, while HTS 1605.21.10 covers all other preparations of shrimps and prawns that meet the non-airtight container criterion. These subcategories allow for more precise duty assessment based on the exact composition and nature of the prepared shrimp or prawn product.