I've been carrying this tool for over six months now and have used it for a variety of different things although mostly for opening beer bottles. It fits perfectly in my travel wallet so it goes everywhere with me. I honestly really love this little thing. It's been very handy in my travels.
I have three Guerrilla Packs backpacks and have been a fan of their backpacks for awhile. The Voltij was my favorite but after getting their new Samurai bag, this is by far my new favorite backpack in my entire collection.