If you haven't signed up for Dropbox, I highly suggest you do so! Plus, it's free! Personally, I think carrying around USB flash drives or SD micro cards is a bit annoying and even more annoying if you lose them.
Dropbox is an online storage space that gives you 2GB of free space for you to upload pictures, videos, documents, folders, and whatever else you may want to access without a USB or memory card.
I back up all my lesson plans, school documents, and resources so I can open or save them at school. It's so convenient and easy to use!