Creature of London won out in a competitive pitch run through AAR over Isobel and George & Dragon. Lucky Generals had also been involved at an earlier stage.
Dan Shute, managing partner of Creature, said: "At Creature, we love a Christmas pitch with a bit of spice, and the brilliant people at Mission wraps have certainly provided that: we're properly looking forward to making some brilliant stuff with them in 2017, even if I have singularly failed to get a 'Christmas wrapping' pun into this quote."
The Mexican wraps and flatbreads company formerly worked with Quiet Storm for creative and Blue 449 for media.
Peter Ellis, the managing director at Mission Foods, said: "We are delighted to be working with Creature who share our ambition to make Mission a hugely successful brand and who will be a key partner in the next stage of our evolution."
Meanwhile, VCCP Media won the media pitch over Havas Media Manchester and Vizeum Manchester.
Marie Oldham, chief strategy officer at VCCP Media, said: "It is a real treat to be working with such a brand as Mission and we are relishing the opportunity to drive growth with them."