Available in patterns like argyle, paisley, and zebra you can add thought and personality to your envelopes without the hassle of printing on an already lined envelope. First you print the envelope. Then you peel and stick these liners inside of any A7, A6, A2, 4-bar, or A8 style envelope. I think these are genius!
There are so many fun patterns to choose from and you can personalize them.
Here are some of my favorites: