What's the difference between Dining Dollars and Flex?

Dining Dollars can be used for any/all food purchases in any of the on-campus dining locations and is tax-free. Flex can be used to make dining purchases too, but also at places like the bookstore, vending and copy machines, laundry facilities, at the Hospitality Desk, and at a variety of off-campus locations. Flex purchases are subject to sales tax.