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There are portable refrigeration devices that would meet your needs, and that could make the trip with you, due to their small size and portability.
The one that I think would best meet your travelling refrigeration needs is the Engel 15 Portable Freezer. It provides for both freezing and refrigeration options and runs on a 12-volt battery or 110 household current. It is used by EMS/Ambulance personnel and Public Health Nurses to maintain proper temperatures for medications and cold packs, as well as for personal medications when camping, boating or travelling.
The specs are as follows:
Model Number MRFD-015D-A
Volume 14 Qts - Capacity 21 (12 oz) cans
Inside Dims (Inches) 13.75 x 7.5 x 7.5
Outside Dims (Inches) 17 x 11 x 14.5
Freezing Ability From zero to 80 degrees
Variable Temp Control
Weight 23.5 Lbs
Refrigerant Gas Type CFC Free 134A
Power Input DC12V - 3.9A
Power Cord 9' detachable
Fuse 10A Thermal
Warranty 1 year
It is available through the dealer - Engel - or through other distributors on the Internet, such as The Cellar Store.