"Red Cup Day," a favorite Starbucks holiday tradition that offers customers free reusable cups, takes place this week -- but there's a catch.

Made from 95% recycled materials, the red cup offers a sustainable way to enjoy festive drinks and rewards for future purchases.

Nov. 14 is Red Cup Day at Starbucks. The 16-ounce, reusable cups are available with certain holiday-themed drinks while supplies last.