I remember the days working as an IT Admin going to client sites popping in a USB or CD/DVD’s to reinstall or fix their computer. Although they are light to carry, why not just use your phone?

A friend of mine turned me onto an Android app called “DriveDroid”. Unfortunately I have not seen or played with an iOS version but the tool works like a charm. I recommend checking it out:

https://play.google.com/store/apps/details?id=com.softwarebakery.drivedroid&feature=search_result#?t=W251bGwsMSwxLDEsImNvbS5zb2Z0d2FyZWJha2VyeS5kcml2ZWRyb2lkIl0.