12 x 15 x 3" Kraft Expandable Self-Seal Envelopes $247.73 12 x 15 x 3" Kraft Expandable Self-Seal EnvelopesSelf-Seal Envelopes make sealing envelopes fast and easy.No moisture needed to seal! Simply peel off tear strip and seal. Tear off strip keeps adhesive free from dust for a longer shelf life. Sides expand... Add to Cart