Just insert merchandise, pull away the protective covering to expose the adhesive strip and Self Seal the Kraft Bubble Mailer Envelope. Made exactly like the Kraft Bubble Heat Seal Mailer Envelopes, except these envelopes have the convenience of a self-seal lip. These mailers feature a 3/16" high slip bubble lining for easy insertion of contents or product. The peel and stick lip provides a secure, tamper-evident closure every time. The recycled golden kraft paper exterior helps avoid using virgin material. No packaging tape, heat sealer or staples are required to close these mailers.