There are all kinds of bottle openers out there, but the PiCO might be the smallest and lightest on the planet. The mico opener is made of 100% titanium in the good ol USA.
How it Works: Using a sturdy split-ring for leverage, and placing your thumb on the opposite side of the cap to lift, the PiCO makes quick work of bottlecaps, requiring only a single tug to remove a cap. It may not be quite as efficient leverage as a full size opener, but certainly no other bottle opener packs this much prying-punch-per-inch! In fact, we find it does a better job than many other keychain designs that are many times its size.
Pangea Designs has launched a kickstarter campaign with the modest funding goal of raising $3000. As of the time of this post the campaign has pulled in nearly $90,000!
You can pick one up through the kickstarter campaign for just $11.