This is brilliant. The Hermetus Bottle Opener and Resealer belongs in your pocket right now because it both opens your favorite beer and hermetically reseals it for future enjoyment. Perfect for any beer aficionado.
Full disclosure, this guy has been around for a little while, but it's too good to pass up. All you need to do is align the lips of the bottle with the metal guides, and slide the plastic seal over it. Completely air and beer-tight so your brew won't ever go flat. Now you just have to come back and drink some more. $8. [Kaufmann-Mercantile via Swiss Miss]