Product Catalog › Jack Link Duos Jalapeno and Mango Beef Jerky 2.85oz Image 1 of 1 Jack Link Duos Jalapeno and Mango Beef Jerky 2.85oz $0.00 Jack Link Duos are sold by the case or the bag, each case has 8 bags. Quantity: Add To Cart Added! Jack Link Duos are sold by the case or the bag, each case has 8 bags.