Comprised of top-quality bubble wrap and an attractive 90 gsm paper outer shell, Jiffy bubble envelopes are crafted for excellent value and a pleasing presentation experience for your customers. They're designed for maximum versality, adhering fully to Royal Mail PiP guidelines for letters & large letters, and come in many sizes and colours. The name "Airkraft" comes from the feather-light weight of the mailers, keeping shipping costs low.