graeme_p - 7:38 am on Sep 2, 2013 (gmt 0)
Unfortunately getting multiple distros on one USB drive takes work. I just keep two small drives just for Linux installs and rescue.
Hanging on boot is not a problem I have come across before. Does it start booting? Does it even get to the boot loader? Also, try pressing ESC (switch to text mode boot) while its booting in case its a problem with the boot graphics.