I doubt it will go bad. However, there might be other issues:
Freeze it, and put some dry ice in the container. The dry ice will keep it cold a lot longer than just insulation.
Dry ice is usually ok on flights, but you do have to package it properly and tell the airline how many kilograms. The package basically has to allow the gas to vent – a styrofoam box not fully taped closed will be fine. And the weight is because there is a limit on the total amount of dry ice the plane can take. So they add yours up along with any others.
I have flown from the USA back to Asia with cured meat products (southern hog jowls) without issue. I freeze them before I go, then wrap with some insulating materials. It survives some 24 hours of traveling without a problem.
Usually at intermediate airports there is no health inspection, so there shouldn’t be a problem in Italy (unless you have separate tickets that require rechecking bags in Italy)
Credit:stackoverflow.com‘
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