This hook-backed i.d./card holder is a perfect size to place on one of our packs, bags, or apparel products. It fits most identification cards such as a drivers license and has a moulded-in loop for attaching to lanyards or carabiners. This extra security means that the i.d. holder can't be easily peeled off a loop patch while traveling. The 3-d rubber moulding makes the product durable and easily washable.