These peel and seal flap envelopes eliminate the need for moistening. Sturdy 24-lb bond paper provides crispness and durability. Simply peel back the strip and fold the flap to close. Peel seal strip feature makes large mailings easier. Ideal for efficient reply mail, invoices and everyday correspondence.These peel and seal flap envelopes eliminate the need for moistening. Sturdy 24-lb bond paper provides crispness and durability. Simply peel back the strip and fold the flap to close. Peel seal strip feature makes large mailings easier. Ideal for efficient reply mail, invoices and everyday correspondence.