Ice packs, gel packs, and packaging

I work for a company who manufactures and ships water icepacks and gel packs for keeping food and medicines cool during transit.

I cannot find the COMM Codes for these, and need to create commercial invoices.

Any assistance would be gratefully received

Most of those things should be 3824.99aa (the “aa” depends on what is on the inside - organic or inorganic chemicals…): https://ec.europa.eu/taxation_customs/dds2/ebti/ebti_details.jsp?Lang=de&selectedReference=&reference=GBBTI503986041&refcountry=&valstartdate=&valstartdateto=&valenddate=&valenddateto=&suppldate=&nomenc=28&nomencto=39&keywordsearch=KÜHLELEMENT&descript=&orderby=0&totalRecords=29&linkVal=&viewVal=&keywordmatchrule=OR&specialkeyword=