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What's a single-lined invitation envelope?
LCI Paper offers dozens of pre-lined invitation envelopes, so we have lots of terminology to distinguish all of our options! A single-lined envelope (as opposed to a double-lined envelope), is a single, outer mailing envelope with a colorful liner on the inside. We have single-lined envelopes in lots of sizes, liner colors and finishes, and flap styles to suit your creative snail mail needs.

Conversely, a double-lined envelope is a traditional inner/outer double wedding envelope set with a liner on the inner envelope.