PepsiCo and Britvic are to perform a duet for their latest cross-brand on-pack promotion.

Running from the end of September until November, bags of Walkers Extra Crunchy and the Pepsi range will give consumers the chance to win tickets to The X Factor live final in December.

Two tickets will be given away every hour for eight weeks and the promotion will be supported by social media, in-store activity and outdoor and consumer press advertising.