I had issues with space. Buying meat in the plastic trays, wasted a lot of space. I have bought a vacuum food saver for a weekend away and plan on following the swaggers advice of pre cooking and vacuum sealing. It stops leaks, even from Tupperware, there is no air in there to speed up the food going off, and also allows more food, less air.... With the added bonus of 'cook in the bag' abilities.
I guess the size of the fridge depends on how many people you need to feed for how long...
It took my wife and kids a while to realize, not all the juice boxes and cans of diet coke need to go all at once. One drink each, then replace when needed...
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