The article mentioned pouring an opened bottle into a half-sized (presumably glass) bottle, but I'm surprised it didn't suggest pouring the wine into a plastic PET bottle, and then squeezing all the air out.
It's a trick I've seen suggested elsewhere before, and one that I've used often myself — it certainly beats paying a hefty sum for a Coravin or VacuVin!
Hikers would be horrified at the prospect of carrying a 750ml glass bottle any distance. Most of us, incidentally, develop a taste for whiskey if they don't have one already. It's a lot more weight efficient, and its drinkable at most any temperature sans ice or mixers.
Jim Beam even sells a 750ml plastic hiker bottle. If Beam isn't your thing, you can always use it as a decanter for your preferred poison once you've finished the OEM liquor.
It's a trick I've seen suggested elsewhere before, and one that I've used often myself — it certainly beats paying a hefty sum for a Coravin or VacuVin!