Package delicate materials inside the waterproof, rip-resistant Quality Park Redi-Strip Tyvek Bubble Mailers to ensure safe delivery. From documents to CD cases, most typical day-to-day mail can fit comfortably inside these envelopes. Their smooth, white construction is backed by durable Tyvek paper for extra support, and the self-sealing flaps are heavily gummed for a tight hold. Envelope/Mailer Type: Cushioned/Media; Envelope Size: 6 1/2 x 9 1/2; Closure: Self-Adhesive; Trade Size: #6 3/4.