kirjekuorien

Kirjekuorien, the Finnish word for envelopes, are essential stationery items used for mailing letters and documents. They are typically made of paper and are folded and sealed to protect the contents during transit. The most common type is a rectangular envelope with a flap that can be sealed with adhesive, water-activated gum, or a self-sealing strip.

Envelopes come in a wide variety of sizes, catering to different document dimensions. Standard sizes are often designated by international or national standards to ensure compatibility with postal sorting machinery. The color of envelopes can also vary, though white and manila (brownish-yellow) are the most prevalent for business and personal correspondence. Custom printing, including logos, addresses, and decorative designs, is also common for branding and personal expression.

The history of the envelope is closely tied to the development of the postal service. Early forms of enclosing letters existed for centuries, but the standardized envelope as we know it began to emerge in the 19th century with the rise of mass mail communication. The invention of the adhesive flap significantly improved convenience and security. Today, envelopes remain a fundamental component of written communication, despite the growth of digital alternatives.