yeah nowadays I use a Zalman USB drive with selectable CD/DVD emulator
https://www.amazon.com/Zalman-ZM-VE350-External-Enclosure-ZM-V350B/dp/B019C23H06
throw a large drive in there and load up multiple ISO files
I swear by one of these https://www.amazon.com/Zalman-ZM-VE350-External-Enclosure-ZM-V350B/dp/B019C23H06
There's also this...
https://www.amazon.com/Zalman-ZM-VE350-External-Enclosure-ZM-V350B/dp/B019C23H06
Thoughts on this one supporting an SSD? I bought it in like 2016 when SSDs were still pretty expensive.
I use the Zalman VE300 for mounting ISO's. That way I never have to screw around with making new configs when I want to add something
https://www.amazon.com/Zalman-ZM-VE350-External-Enclosure-ZM-V350B/dp/B019C23H06/
For thumb drives, they are so cheap now especially for the 8GB and 16GB ones that I just buy a ton of them and make duplicates. There is plenty of times that I have to work on more than 1 computer at the same time and having a few of the same thumb drive full of files comes in handy. I put the WSUS offline updater on 3 drives so that I can do new computer setups quicker. I'm thinking i'll expand it to 5 so I have a little more flexibility. Also if you are going to put WSUS offline on a drive, know that you'll need a 32GB one as of last month. With selecting every OS's x86 and x64 version of updates, plus office updates for 2010,2013,2016 that it will take just under 19GB of space now.
Here is just some of the drives I have: http://i.imgur.com/Vix512B.jpg
Personally, I like this one that I use :) http://www.amazon.com/Zalman-ZM-VE350-External-Enclosure-ZM-V350B/dp/B019C23H06/ref=sr_1_1?s=pc&ie=UTF8&qid=1462572268&sr=1-1&keywords=zalman+external
Buy a Zalman ZM-VE350 stick a ssd in it, load it up with isos and rock on.