I just recently purchased three Kingston USB 3.0 flash drives and have made bootable images on two of them without issue (with Rufus 3.8 in W10). Both booted and ran without a hitch when tested on my Toshiba L650 laptop.
Kingston 16GB 100 G3 USB 3.0 DataTraveler (DT100G3/16GB)
I use Lastpass. There are one time passwords that you can generate that only work for one login and there are some multifactor features available as well. It may not be perfect, but it is definitely better than trying to keep passwords in a ratty old notebook (my previous method).