I have a propane/120 volt refrigerator/freezer in my camper. For safety reasons I turn off the propane when moving. I keep the freezer section mostly full of the blue ice containers, which keeps things cool, for short trips (~24hours) between electrical connections.
It becomes ineffective for longer trips, as 24 - 48 hours of electrical supply is required to get things cooled off again. Generator for a couple of hours, or overnight electrical connection does not get it ready for another day of travel.
The freezer is about 16 inches wide, 4 3/8 inches tall, and 7 inches deep. Tank Calculator tells me this is just over 2 gallons or 7.8 liters. Unlike an ice chest, the refrigerator/freezer does not do well with uncontained loose liquids (i.e. melted ice). Normally we put a towel on the bottom shelf of the refrigerator to absorb any condensation that might otherwise puddle and leak.
I am thinking that a container that I can fill with ice cubes purchased in bags at a gas/convenience store is the solution. But I am wondering what attributes to look for in the container. It needs to be able to stay sealed and not leak with partially melted ice and water sloshing around, while driving at speed on country roads and highways.
What to look for in a leak proof ice container, for RV fridge?