WKD is investing £8m in a promotional tie-up with the clothes retailer USC. The on-pack promotion invites consumers to 'Unzip some WKD USC Brands' by offering a £5-off voucher on single bottles, four-packs and 12-packs.

The campaign will run from this month until the end of April and includes a free prize draw to win a makeover worth £1,000, a year's supply of WKD or a £500 shopping spree.

"This is a great brand association because USC is a key shopping destination for our 18 to 25-year-old male audience," said Karen Salters, marketing director, Beverage Brands.

The company is backing the campaign with press and online ads and USC is creating window displays in all its 58 stores.