Durable 28LB Manila Envelopes crafted from 28lb paper, stronger than standard letter envelopes, resisting tears and wear in everyday mailing use. 6x9 manila envelopes feature ultra strong quick-seal strips-peel off the white liner, fold, and press to seal securely, keeping mail safe and protecting contents from damage. 100 pack of self seal envelopes for small offices, home filing, and bulk mailing. Smooth, blank surface works perfectly with inkjet and laser printers for printing addresses or shipping labels opaque paper keeps contents confidential. Ideal for mailing catalogs, magazines, documents, direct mail, paperwork, letters, invitations, photos, promotional materials, and brochures. Weight: 2.07 pounds.