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.