Showing 1–12 of 378 results

Straight Flap Envelopes for Weddings, Business Mailings, & More

Straight flap envelopes, sometimes called square flap envelopes, are clean, modern, and great for greeting cards, wedding invitations, and business mailings. LCI Paper offers hundreds of premium quality straight flap envelopes in fun colors and finishes to complement your brand and style.
So Many Straight Flap Envelopes!
Shop a selection of square flap envelopes in sizes small and large and in styles classic and cutting edge. Here are some popular ones:
Recycled straight flap envelopes | Linen Straight Flap Envelopes  | Bulk Straight Flap Envelopes
Order Straight Flap Envelopes Printed or Blank
Our square flap envelopes are sold blank, but printing with addresses and/or your logo is always available! To save you time and hassle, we can professionally print your envelopes in white, black, or full color ink.
Don't Forget the Straight Flap Envelope Liner Paper!
Design your own straight flap lined envelopes with our drop in envelope liner paper! Order colorful liner inserts blank or customize with your design.