The 2026 Trader Joe's Mystery Bags contain three surprise reusable tote bags, each featuring a multi-color design. Made of polyester, these foldable bags have dimensions of 12 inches in length, 16 inches in height, and less than 6 inches in width. The bags are sealed and come in an original pack.   A unique and eco-friendly addition to your shopping needs.  The photos are of the brown paper bags (front and back) that hold the 3 actual Mystery Bags.