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 .
Warren S/V Scuba Doo Lagoon 50 (winner of best crewed yacht under 55 feet at the St. Thomas crewed yacht boat show).