Update: I received a message from Gratsy sayong more of these are now available! Get a free Gratsy Summer Road Trip Snack Box! Facebook messenger required.
Visit the linked page to be directed to Gratsy on Messenger. Click 'Get Started' and answer the questions. If you're one of the 1st 20,000, they'll send you a free Gratsy Summer Road Trip Snack Box!
Available while supplies lasts!