iPhone and iPad

If you could only keep one piece of technology would that be? Your iPad, your iPhone or perhaps something else? We have been asking each other that question a lot lately on our podcasts and TiPb TV. So I wanted to know what was everyone else's most favored piece of technology. For me it is my iPhone. I keep it close by me at all times and it works as my personal mini computer, my phone and my entertainment device. What tech would be your sole survivor?