The flash drive is easy to build on Linux and OS X, since the "dd" tool comes preinstalled with the system, and is a command-line tool. Write The ISO to a Flash Drive: Linux and OS X Instructions
Obtain the Linux Mint 18 ISO from the Official Download Page. This article will explain how to get Linux Mint 18 onto a USB Flash Drive (4GB Minimum), using either Linux, Windows, or Mac. Linux Mint 18, code-named "Sarah", was released on June 30, 2016. There are two Desktop Environment choices, MATE and Cinnamon. Linux Mint is a popular Ubuntu-based Linux Distribution that aims for an easy desktop usage experience, from installation to day-to-day work.