I've been involved with crypto-currencies 3yrs now and have never used a USB flash drive to store my btc . Recently, I have been highly considering to get one that is specifcally designed for digital currencies such as the 'Ledger', nano, and whatever else that is popular amongst the crypto-space!
Earlier I was watching 
Honestly, I never even watched tutorials on how to go about it & so, now is a great time to learn, considering hearing of all of these security attacks. And I do hope this helps others as well, who would like to understand how this all works.
No lie, recently(last wk) I had a thought and I was wondering if it was possible to back up digital currencies from a regular USB-Drive and BAM an article appears the following week ;) I think this is very cool how we can use USB's as a bank. Times are changing ppl!
https://news.bitcoin.com/bitcoin-bank-less-thirty-minutes-usb-drive/?utm_source=OneSignal%20Push&utm_medium=notification&utm_campaign=Push%20Notifications
cLICK link above to read full article on how to go about storing your coins offline using these regular USB's - ENJOy! I know I am ;)
HERE ARE A FEW PICS OF WHAT TYPE OF USB'S CAN BE USED