Country Bob... Excellent idea!
I have done the rock thing with moderate success and was determined on my next outing to take my soft shot scuba weight belt, just in case. Your wine box bladder idea is better...consume wine, recycle cardboard box, and use bag. Obviously, the bigger the wine box, the better. However, to be eco-friendly, do I need to buy the rest of my wine in bottles?
Nope, I will just buy the box, and have a ready reserve of bags for fellow campers as the need arises.
Ah, the beauty of Occam's razor.
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