Is it possible to upload pictures from an iPhone directly to a USB stick?

I need to back up my iPhone photos, and I don't have enough iCloud storage to back them up on to there, and my computer memory is too full to handle all my photos (that's right).So I was wondering, is it possible to upload iPhone photos straight to a USB stick? (through the computer) If so, how? Thank you!

Added (1). Oh yeah I'll be using a Mac

Nope but I can on my DROID

Ok. Here is the solution. It's quite manual but you will need to read carefully.
Open 2 computer libraries. Make sure your iPhone and USB stick are plugged in. Click on the USB in one tab and the iPhone in another. Find your pictures in the iPhone tab and highlight them all. Right click and click copy. Close the iPhone tab. Go into memory stick and right click. Click paste and if necessary wait for it to load.