Product Information: JL3 205 x 320mm, Astrobubble Protective Liner. PLEASE NOTE THESE SIZES REFER TO THE INTERNAL, USABLE AREA, OF THE POUCHES. The retail favourite, Jiffy Airkraft is a lightweight, economical mailer that gives you all the protection you need with the added benefit or reduced postal costs by using super lightweight 92 gsm paper. Jiffy Airkraft has a fully laminated lining of Astro SupraBubble for extra strength and puncture resistance with a strong self-seal closure. Perfect for mailing items that are susceptible to impact during transit, ideal for fulfilment houses, mail order and contract packers.