Installing multiple iso on a usb drive with Ubuntu

I'm using Multisystem to install multiple isos on a USB drive.

Download:
http://liveusb.info/multisystem/install-depot-multisystem.sh.tar.bz2

unzip and run:

sudo install-depot-multisystem.sh

This will install all required packages and multisystem. After this just run mutisystem from the Ubuntu menu.

MultiSystem allows you to boot your USB drive using QEMU inside Ubuntu to test that the drive is working before booting it on another machine.

reference:
http://www.pendrivelinux.com/multiboot-create-a-multiboot-usb-from-linux/