If your business is planning to send out bulk flyers, promotional letters, or announcement mailers through the Hong kong Post Circular Service, the first thing you must understand is the official format requirements.
Even a small format error could cause your mail to be rejected — wasting time, money, and delaying your entire street marketing plan. This simple guide will help you master all the key specifications in just a few minutes.
📏 Circular Mail Format Essentials
1️⃣ Size, Weight, Shape & Content Rules
| Size | Minimum: 90 × 140 mm ｜ Maximum: 150 × 220 mm |
| Thickness | 0.1 mm (approx. 128gsm paper) – 10 mm |
| Weight | Up to 150 g |
| Shape | Square or rectangular (custom shapes allowed) |
| Content | Each circular must contain identical content – no personalized variations per recipient |
2️⃣ Delivery Marking Requirements
Each circular mail must include a Delivery Marking printed clearly on the top right corner of the envelope or flyer.
Marking Size:
- Maximum: 40 mm (W) × 30 mm (H)
- Minimum: 20 mm (W) × 15 mm (H)
- This marking allows postal workers to easily identify circular mail during sorting and delivery.
3️⃣ “No Circular Mail” Label Mechanism
Residents or businesses may display an official “No Circular Mail” sticker issued by Hongkong Post on their mailbox or door.
If this label is visible, postal staff must skip that address and are not allowed to deliver any circulars — even if your mail fully meets format standards.
👉 Therefore, always include the “No Circular Mail” disclaimer clearly on your circular design before printing.
📦 What to Do Before Mailing
✅ Step 1: Submit Sample for Approval
All circular designs must be submitted to Hongkong Post (in PDF or printed sample) for review.
Typical approval time: 1–2 working days
✅ Step 2: Prepare Mail Bundles
Circulars must be sorted and bundled according to Hongkong Post’s specifications.
💡 Tip: Pre-book a submission timeslot at the Business Mail Centre to ensure smooth processing.
✅ Step 3: Delivery Method
Unaddressed circulars must be submitted directly to the Business Mail Centre — they cannot be dropped into street mailboxes.
💡 Want an Easier Way? Let Flyer King Handle It for You
Skip the paperwork and let the professionals handle it!
At Flyer King, we offer a one-stop Circular Mail Service — from design, printing, bundling, to mailing, all managed by experienced specialists.
With over 10 years of experience and 1,000+ successful campaigns for Hong Kong enterprises, we know every step of the postal circular process — ensuring smooth approval, timely delivery, and cost efficiency.
Whether you’re in retail, education, finance, F&B, or service industries, we’ll help you:
- Create compliant designs that pass postal checks
- Identify your target audience by location
- Maximize exposure through strategic delivery
- Save time, manpower, and mailing costs
🎯 Get your message delivered faster and smarter — without the hassle!📞 Contact Us Now: https://wa.me/85294046128
🌐 Official Website: https://www.flyerking.com.hk