Flash drivers are getting faster and cheaper all the time. Take the Kingston DataTraveler Max 512 GB USB Flash Drive for instance: it comes with plenty of space for your files and videos and delivers reads and write speeds up to 1000 MB/s and 900MB/s.
This flash drive is ready for 4k/8k videos, music, and everything in between. Expected to ship in mid-July. You can find out more about it here.