The Swiss army knife has a lifetime warranty and is the brand that MacGuyver used in his series so you know that it's good. The keychain side of the knife contains a bottle opener while the other side contains a can opener with a sharp cutting edge. The bottle opener has a flathead screwdriver on its top. You can use it to open bottles of ale when traveling through Europe by using a leverage technique. The top should then easily come off of your desired bottled beverage.