I sometimes take a drawing to work if I think I might have a lunch break. I try to take something that doesn't tear, or bend, or crease in my briefcase. Ampersand pastelbord is ideal, it survives the journey intact, of course getting coffee tipped on it is a whole different thing.
This fox is on the sand colour, it's 11 x 14 and up to now I've just used coloured pencils, that however could change any second I can feel the call of the acrylic.
I didn't get work on it at lunch by the way, I remembered had to pick some frames up from my local art shop.