Yep! Square everything ... Juice, butter, etc .... and where possible we use zip-vac bags ... Less space than Tupperware 
We used to survive with a 45L Coleman esky (family of 5) for 3-5 days depending on weather. Used block ice, split in half, and put in the tucker box at home for 2-3 days before leaving ... Block ice at -25 to -30 lasts real well 
On the basis that a 45L esky was big enough, I figured a 47L fridge (without the space the block ice took up) would be plenty .... I was right! .... and now we're a family of 2 + 1 part timer so 47L is plenty!
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Kev..
Going ... going ... almost gone ... GONE !! ... 2004 D2a Td5 Auto "Classic Country" Vienna Green
2014 MUX LST with fruit
2015 Kimberley Kamper "Classic"
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