A smart operator like Snowden would go to a wifi hotspot and run TOR on a clean machine to upload data to WikiLeaks.
A Raspberry Pi 3 is the perfect tool for this...for several reasons.
Just pop in a clean SD card with Raspbian, TOR and the data on it. Upload the data, pull out the card and destroy it. Go about your business.
Pi 3 has built-in wifi/bluetooth... all you need is the Pi, a 7” monitor, a bluetooth mini keyboard, a battery pak and an SD card. All will fit in a tiny sack. Total cost about 125 USD.
Just make sure it's a camera-free hotspot. Because, if NSA has compromised TOR, they'll attack the hotspot's video surveillance system. You wouldn't believe the number and quality of cameras installed in newly opened or renovated restaurants!
Also, remember to change the Raspberry Pi's MAC address, because it will be in the hotspot's log.