In addition to the TextBlade (probably in pocket), my future bag will have a NexDock, Nexus 6P (actually in pocket), ChromeCast, and a Raspberry Pi (3 or zero+WiFi?). I can throw in an iPad mini as well, but I don't really need it.
The NexDock acts as a power bank, but add in a purpose built power bank/WiFi router like the HooToo wireless travel router running OpenWrt.
I'll need a couple of reliable USB/Bluetooth HID dongles and look forward to WT's "Imagine if the NanoCharger becomes the NanoDongle." mentioned on May 15th, 2015.
This collection lets me consume any interesting media, do Linux-based work on the go, remotely access any of my systems, and plug into any local systems using my preferred keyboard and display. The NexDock has a track pad, but I might want to add a proper mouse.
Can I replace the Pi with Termux on my phone? An Intel Compute Stick and a ChromeBit are tempting but unnecessary.
[the Amazon links have a theoretical commission for me, but in over ten years I have yet to receive one cent.]
...and I'll need at least one USB charger.
$20 USB Charger
40 HooToo travel router and power bank (running OpenWRT)
40 Raspberry Pi 3
82 ASUS Chromebit CS10
100 Misc, micro SD card(s), USB cables, USB/Bluetooth HID
160 NexDock + shipping and tax
499 Nexus 6P
524 Intel 2nd generation Compute Stick Core m5 vPro Processor (no OS)
Depending on how you count, that's up to 5 computers.