what's the best solution to take a portfolio with clipboard with you when your hands are full moving a cart from point a to b?

my new job involves taking labor samples from point a to point b in a huge university campus involving several buildings using a cart. There are lots of downtime and many of my talkative future coworkers sip coffee and smoke several times a day, which I find boring, unhealthy and a waste of time. They're not interested in learning something new.

I'm studying to be a Physician Associate, so my job is not completely unrelated to my major. I plan to use my downtime to learn chemistry, anatomy, active ingredients...

Most of my learning materials are printed in A size papers, ANSI standard, which is perfect to be stacked, put in a portfolio with clipboard and study on the go during downtime.

Obvious solution would be to use a portfolio bag, but I wanted to ask you if you can think of something better.