If you are using a folder inserter, or simply need a high-quality envelope for your business, you should consider using our great selection of #9 and #10 business envelopes from Relyco. These envelopes come in a wide range of configurations including single window, double window, top flap and bottom flap designs. Relyco envelopes are the envelope of choice by Formax, who regularly tests customer documents in Relyco envelopes. These envelopes aren't your cheap run-of-the-mill designs that you find in your local department store. These are high-end envelopes designed to keep your mail protected until it meets its destination. Lock in these great prices and buy your Relyco business envelopes today!