We have tried a couple of different ways over the years to take in a little vino around the campfire late at night.  I have taken some good Cabernet in a bota bag - those goat skin squirt bottles.  It can take a LOT of punishment and not leak.  I have tried a lot of the box wine at home and it is becoming quite popular for good quality wine to be put in the boxes - not just rot-gut.  5-litre - just remember it does get lighter throughout the trip :-)  The cheaper is like Almaden the better is Banrock Station and some pretty good is Black Box.  Just some suggestion.  We enjoy it.  Walleye at midnight a a toast with some Cab at 1 am - a perfect trip :-)