Worldwide catastrophe occurs, what device do you cling to?

Many of us have more than one device, proven on our Windows Community Conversations and by our responses on any given topic, which one device would you consider most valuable? Back up your answer and explain why! 🔘🖥💿📸📹🎥💽💻 Laptop...PC...Smartphone...Tablet...Back up Hard Drive...Flash Drive...digital camera....blue tooth device... your childhood security blanket... Things to consider: internet access...battery life... hardline access vs. no cell towers...durability of your chosen device... Your most valuable means of communication would be what? Microsoft...have they covered all of the bases??? I realize this is a whacky question....but just imagine....