Product Description One carton of 10.5 x 15.25" (No. 5) Self-Sealing Poly Bubble Mailers. 100 Mailers in a Carton. Poly bubble mailers combine the strength and versatility of a courier envelope with the cushioning of a bubble-lined mailer. Each Poly Airjacket mailer is made from a durable, moisture resistant, multi-layer blend of co-extruded polyethylene film with a resilient bubble lined interior. The bright white exterior film creates the professional image you are looking for and our pressure sensitive self-seal adhesive closure system is reliable, tamper-evident and easy to use. Convenient tear strip allows the mailer to be opened more easily by the recipient but does not compromise the integrity of the mailer or the security of the contents in transit. 100% recyclable!