Starbucks' popular "Red Cup Day" will take place this week as the company gives customers reusable holiday cups for free -- but only if they order one of the qualifying drinks.

The unofficial holiday observed by Starbucks customers is almost here. Red Cup Day is tomorrow, here's what to know ahead of time

The iconic red holiday cups are back at Starbucks. The coffee chain giant is doing its annual "Red Cup Day" giveaway on Thursday, Nov. 14. Customers who purchase a Starbucks holiday drink can receive one of the red, 16-ounce cups for free, while supplies last.