Reuseing wine bags.
This seemed like a good idea, so I cleaned one out But refilling was an awfully slow and awkward procedure, and not one I would want to do anywhere else but at home. Also, unless you design and make your own carriers they are not the easiest things to get water out of in a camping situation. Finally, the one I used tended to leak slightly unless it was full. But I have noticed that when half full of wine and different brands might have better taps.