When shopping for sunglasses, don't forget to store your sunglasses in a bag or pouches. These items keep your sunglasses clean from dirt and debris and also protects them from scratches. When storing your sunglasses, always make sure to keep them in a safe place and never in places like your dashboard (where they can melt in hot weather) or in your glove compartment unless you plan to buy sunglasses cases to store them in. Regardless, if these items are for you or your customers (if you plan on buying in bulk) than the decision to buy bags & pouches is an obvious choice.
Also, please don't forget to get some sunglass cords as well - they are great as an up sell!