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.