Catalog Envelope, 28 lb Bond Weight Kraft, #1 3/4, Square Flap, Gummed Closure, 6.5 x 9.5, Brown Kraft, 500/BoxQuality Park catalog mailing envelopes are perfect for shipping, storing or organizing. Heavyweight 28 lb paper withstands extensive handling at home, in the office or on the mail route. These envelopes are perfect for small flat or larger folded documents. A wide, heavily gummed commercial flap seals tight with moisture to keep inserts secure. Center seams give added strength for heavy contents.