On our last trip, We took a polar bear back pack carry on. If anything melts to a liquid state it will be confiscated. We also took and checked a polar bear 48 can size cooler. Both coolers were stuffed. No issues with weight. The 48 can cooler weighed 40 pounds full
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Warren S/V Scuba Doo
Lagoon 50 (winner of best crewed yacht under 55 feet at the St. Thomas crewed yacht boat show).

https://www.cyabrochure.com/ebn/2307/pdyrX/6642/4///