MultiBoot USB
This is a project that contains a collection of GRUB files and scripts that will allow you to create a pendrive capable of booting different ISO files.
The Arch Anywhere ISO contains an automated install script giving you the ability to install a fully custom Arch Linux system in minutes. Write the Arch Anywhere ISO to a CD or USB, boot it up from your computer or VirtualBox, and type ‘arch-anywhere’. This will invoke the built-in dialog installer allowing you to install Arch Linux with a simple menu system.