The rebranded packages, designed by Leeds-based Principles Agency, are out this month in three bold colours: orange for Worcester Sauce flavour; turquoise for Sour Cream and Onion; and purple for Jalapeno Chilli.
The flavours are all linked in with a different type of man, which is highlighted on the packaging: "moody and unpredictable" is Jalapeno Chilli; "strong and dependable" is Worcester Sauce; and "cool and sophisticated" is Sour Cream and Onion.
Each packet also features a love heart in the centre with the words: "Love Pretz. Make a date with your tastebuds."
Historically, the Pretz brand has targeted the children's snacks market but Sun Valley is hoping the rebranded packets will attract the attention of young women.
Mike Hackett, managing director of Principles Agency, said: "To help Sun Valley understand its market, Principles Agency carried out extensive consumer mapping of the snacks sector, with a particular focus on health conscious products.
"The sector has become crowded with healthy snacks, so we needed to differentiate our client's offering. The results identified a real need to breathe new life into the logo and packaging to appeal to the health-conscious young woman."