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LUX 6 1/2 x 9 1/2 Open End Envelopes in Midnight Black perfect for organizing documents/promotional materials/marketing materials/mailings/filing, sold as 50 per box. The 6 1/2 x 9 1/2 Open End Envelope in Midnight Black is our darkest envelope and made from quality 80lb. paper. Booklet envelopes are the professional way for sending contents you can't or shouldn't fold such as flat but bulky materials like pamphlets, brochures, sales literature, booklets, annual reports, magazines, or catalogs. Featuring a square back flap that's easily sealed by our Peel & Press strip, you'll save yourself the hassle of having to like or moisten each envelope.