endoc 10x13 open end self seal envelopes - bright white 28lb heavyweight paper 10 x 13 inches envelope for home, mailing documents, office, business, legal or school - 35 pack endoc business envelopes and large catalog envelopes for most general correspondence needs, business envelopes are the perfect solution and are available in a diverse range of sizes, paper weights and finishes with a variety of closure types and different numbers of windows. when dealing with thicker materials, such as an entire booklet, brochure or written report, a large catalog envelope comes in handy with reinforced seams to support heavier contents. choose an envelope with a printable exterior and follow an online envelope template to eliminate handwriting messages.