If you need to install some Linux images on an USB, Universal USB Installer is a great solution. Is a program that use Linux to create Bootable USB’s and allows you to choose what Linux Distribution you will put on your Flash Drive. Easy to use, simple and efficient, this program is well known for its flexibility.
It’s important to know that your USB drive should be Fat16, Fat 32 or NTFS and you will need a PC with BIOS that can boot from an USB.
To create Multiboot USB and add Sysem Tools or Antivirus Utilities, you can use YUMI, another flexible program that is free and open source.