What about Drive Droid?
https://play.google.com/store/apps/details?id=com.softwarebakery.drivedroid&hl=en

From their page:
"DriveDroid allows you to boot your PC from ISO/IMG files stored on your phone. This is ideal for trying Linux distributions or always having a rescue-system on the go... without the need to burn different CDs or USB pendrives."

Put as many isos as you can on a 128Gb micro SD card, and you are good to go. Only one step.

perhaps
http://www.easy2boot.com/
?

I haven't tried this.

regards,
Daniel Villarreal
http://www.youcanlinux.org/

On 09/26/15 10:53, William Park wrote:
Hi all,

Right now, I'm carrying around 2 USB sticks,
     - one 32GB -- it boots Linux and contains about 10 bootable ISOs.
     - one 8GB -- to 'dd' the real ISO that I want to boot.

It's 2-step process, and it's ok.  But, I would like to reduce it to
1-step.

How can I boot those multiple ISOs directly from one USB stick?
...
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