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Envelope Sizes Guide for Expo Invites: DL, C5, and C4 Explained


Choosing the right envelope size matters more than many think—especially for expo invitations where first impressions last. This guide breaks down the essentials of DL, C5, and C4 envelopes. Whether you're creating a luxury invite or matching a letterhead for print, knowing these sizes helps make design decisions smoother and more impactful.

Why Envelope Sizes Matter

The envelope is the first thing recipients see. Its size affects your design layout, print costs, and how your content arrives—flat or folded. Using the wrong size can lead to creased content, postage issues, or a poor visual experience.

DL Envelope: Sleek and Professional

· Size: 110 × 220 mm (4.33 × 8.67 in)

· Best for: A4 letterhead folded into thirds

DL envelopes are ideal for formal communications, RSVP forms, and minimalist invites. They're slim and save space, often used in professional letterhead and envelope printing setups.

C5 Envelope: Luxury Invite Favorite

· Size: 162 × 229 mm (6.38 × 9.02 in)

· Best for: A5 content or A4 folded once

C5 is a sweet spot for expo invites. It’s large enough for a main card, RSVP insert, and brochure, yet compact enough to remain elegant. This size allows for textured paper, foil stamping, and high-end finishes—perfect for upscale events.

C4 Envelope: Full-Size Statements

· Size: 229 × 324 mm (9.02 × 12.76 in)

· Best for: Unfolded A4 documents

C4 works when you need to send flat documents—certificates, expo brochures, or presentation invites. No folding means a premium experience, especially when combined with heavier paper (135–160 gsm).

Tips for Envelope Selection

· Use DL for letters or RSVP cards in trifold.

· Choose C5 for folded A4 or multi-piece invites.

· Select C4 to preserve full-size prints flat.

Design and Print Best Practices

· Always match your envelope to the content dimensions.

· Use high-quality textures or coatings for a luxury feel.

· Stick to standard sizes to avoid extra postage—non-standard envelopes often cost more.

Key Takeaways

· Envelope sizes directly influence content layout, mailing, and visual appeal.

· ISO “C” series relates to “A” paper sizes: C5 fits A5, C4 fits A4, etc.

· The right envelope enhances both form and function.


Media Print UAE understands the art of pairing design with detail. Whether you need classic DL or a luxurious C5 invite, selecting the right envelope size ensures your message arrives intact and makes an impression.

 

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