Do Not Double Stack Shipping Labels always be used for a suitcase that has fragile stuff in box. Shipping Warning Fragile Stickers uses the bright color to emphasis the information to the shipping handlers. Fragile Stickers will remind shipping handlers to handle gently. Self Adhesive Sticker is easy to stick to package bag, package boxes and so on without leaving any marks and dirt. QUALITY CUSTOMER SERVICE: Any question about products or orders, please feel free to contact the customer service, we will try our best to solve the problem.