What You Can and Cannot Ship with Click Post | Product-by-Product Checklist for 3 cm, 1 kg, and 185 Yen (240 Yen & Revised Terms from Oct 1)
Through September 30, 2026, Click Post at 185 yen is the most affordable option for products that meet all three conditions—thickness within 3 cm, weight under 1 kg, and size within A4—and do not require damage compensation. Starting October 1, the rate increases to 240 yen, size limits shift to total three dimensions within 60 cm, longest side within 34 cm, and weight under 2 kg (provided the package fits into a street post box), with dispatch limited in principle to post-box drops. If your item doesn't qualify, your best alternatives are Yu-Packet 3 cm (360 yen), Letter Pack Plus (600 yen), and Yu-Pack (from 820 yen), chosen based on unit price and whether you need compensation.
Quick Reference: 20 Product Types x Eligibility x Alternative Services
| Product Category | Verdict | Notes | Alternative Service (if Ineligible) |
|---|---|---|---|
| Accessories (earrings, necklaces) | ✅ Eligible | Stays under 2 cm even with cushioning | — |
| Stickers & decals | ✅ Eligible | Stays under 1 cm with cardboard backing and envelope | — |
| Cables (USB, TRRS) | ✅ Eligible | Measures around 2 cm when coiled | — |
| Slim phone cases | ✅ Eligible | Within 2 cm for single items | — |
| Screen protectors | ✅ Eligible | Flat and under 0.5 cm | — |
| Handkerchiefs & thin fabric items | ✅ Eligible | Under 2 cm when folded | — |
| Paperback pocketbooks (bunko) & thin booklets | ✅ Eligible | Thickness under 2 cm | — |
| Resin keycaps (up to 5 pieces) | ✅ Eligible | Switch to Letter Pack Light for more than 5 | — |
| Business cards & postcards | ✅ Eligible | Virtually zero thickness | — |
| Enamel pins / pin badges | ✅ Eligible | Prime example of small and lightweight goods | — |
| Folio phone cases | △ Measure first | Around 2.5 cm bare; packaging risks exceeding 3 cm | Yu-Packet 3 cm (360 yen) |
| Padded / thick pouches | △ Measure first | Padded interiors easily push thickness past 3 cm | Yu-Packet 3 cm (360 yen) |
| Multi-item bundles / sets | △ Measure first | Weight and thickness accumulate with item count | Letter Pack Plus (600 yen) |
| Small candles | △ Measure first | May exceed 3 cm depending on shape | Yu-Packet 3 cm (360 yen) |
| Thick books (tankobon) | △ Measure first | Many books sit right on the 3 cm borderline | Letter Pack Light (430 yen) |
| Glass & ceramics (fragile items) | ❌ Ineligible | No compensation means out-of-pocket loss on damage | Yu-Pack (from 820 yen, includes compensation) |
| Thick folio phone cases | ❌ Ineligible | Guaranteed to exceed 3 cm | Letter Pack Plus (600 yen) |
| Items over 1 kg | ❌ Ineligible | Exceeds weight limit | Letter Pack Plus (up to 4 kg, 600 yen) |
| High-value items (3,000 yen or more) | ❌ Ineligible | High risk without damage compensation | Yu-Pack (up to 300,000 yen compensation, from 820 yen) |
| Orders requiring cash on delivery (COD) | ❌ Ineligible | Cash on delivery not supported | Yu-Pack / Takkyubin (supports COD) |
Note: The determinations above are based on the criteria in effect through September 30, 2026 (thickness within 3 cm, weight up to 1 kg, A4 size). Starting October 1, packages qualify as long as their total three dimensions are within 60 cm, longest side is within 34 cm, weight is up to 2 kg, and they can be dropped into a post box. Consequently, some items currently marked "△ Measure first" or "❌ Ineligible" may become eligible for Click Post.
I often hear from merchants who freeze before packing an item, wondering: "Can I actually ship this with Click Post?" While the official criteria through September 30 seem straightforward—thickness within 3 cm, weight under 1 kg, and A4 size—the moment you add protective wrapping, borderline dimensions can shift. In day-to-day fulfillment, accidentally crossing that 3 cm limit is an everyday hazard.
Over the past three years, I have fulfilled more than 2,200 orders using Click Post. More than once, a post office counter clerk has rejected a parcel right back to me, saying, "This is 3.1 cm, so we can't accept it." To save you that frustration, I have organized products into three clear tiers—"Eligible without hesitation," "Measure before shipping," and "Skip and use an alternative"—along with concrete pricing and recommendations for alternative services.
Click Post Size and Weight Requirements
Let's start by reviewing the official criteria for packages eligible for Click Post.
| Item | Criteria (Through September 30, 2026) | Starting October 1, 2026 |
|---|---|---|
| Longest side | 14 cm to 34 cm | Within 34 cm |
| Shortest side | 9 cm to 25 cm | (Included in 3-dimension total) |
| Thickness | Within 3 cm | Included in total dimensions of 60 cm |
| Weight | Up to 1 kg | Up to 2 kg |
| Rate | Nationwide flat rate of 185 yen | Nationwide flat rate of 240 yen |
| Drop-off method | Post box or post office counter | In principle post box only (counter allowed only under exceptional conditions) |
Under the rules through September 30, any item that fits into an A4 envelope (Kakugata No. 2), stays within 3 cm thick, and weighs under 1 kg can be shipped. Packages are delivered straight into the customer's mailbox, meaning buyers do not need to be home to receive them. Because every label includes a tracking number, you also cut down on "Where is my package?" inquiries from buyers after dispatch.
Examples of Products Well-Suited for Click Post
Accessories & Jewelry
Items such as earrings, necklaces, and bracelets are typically compact and lightweight, making them almost guaranteed to meet Click Post's limits. Even after wrapping them in bubble wrap or other cushioning, keeping the package well under 3 cm thick is straightforward.
Stickers & Decals
These are prime examples of flat, ultra-lightweight merchandise. Placed against a rigid cardboard backing inside an envelope, the package easily stays under 1 cm thick, so you rarely need to worry about Click Post's size limits.
Cables & Electronic Components
The TRRS cables (interconnect cables for split keyboards) that I sell fit neatly into an A4 envelope when coiled, measuring only around 2 cm thick. Small electronic parts like USB cables and adapters behave similarly. Cables also have the advantage of being flexible, making it easy to flatten and adjust their shape during packaging.
Resin Keycaps & Small Handmade Crafts
Resin artisan keycaps weigh only about 10 to 20 grams each, and even when wrapped in protective foam, they almost always stay under 3 cm. However, be careful with total weight and thickness when bundling multiple items into one order. In my own store, orders of five or more keycaps occasionally exceeded 3 cm after packing, so I make it a rule to switch those orders over to Letter Pack Light.
Smartphone Cases & Screen Protectors
Slim phone cases and screen protectors are staple products that are very easy to ship with Click Post. Bulky cases, such as wallet-style folio covers, can easily cross the 3 cm threshold, so always measure your package after packing to be safe.
Fabric Items, Handkerchiefs & Pouches
Thin textile products are easy to fold down under 3 cm. Keep in mind, however, that bulky pouches or padded fabrics may still exceed the thickness limit even after compression.
Products Not Suitable for Click Post
Click Post cannot handle every type of product. For the following scenarios, you should consider alternative shipping carriers.
| Condition | Reason | Alternative Method |
|---|---|---|
| Thickness exceeds 3 cm | Cannot be shipped because it exceeds Click Post limits (eligible from Oct 1 if within 60 cm total dimensions) | Letter Pack Plus (600 yen), Yu-Pack |
| Weight exceeds 1 kg | Same as above (eligible up to 2 kg from Oct 1) | Letter Pack Plus (up to 4 kg), Yu-Pack |
| Fragile or high-value items | No compensation (no reimbursement in the event of shipping damage) | Yu-Pack (up to 300,000 yen compensation), Takkyubin |
| Customer requests Cash on Delivery (COD) | Click Post does not support COD | Yu-Pack / Takkyubin (COD supported) |
| Recipient signature required upon delivery | Delivered directly to mailbox without hand-to-hand delivery | Courier services (in-person delivery) |
The presence or absence of compensation deserves particular attention. Click Post does not offer any indemnity program for transit incidents, meaning Japan Post will not reimburse you if a package is damaged or lost. Whenever you ship high-value merchandise, selecting a carrier service that includes compensation is the safest policy.
Additionally, Click Post delivers every single day, including Saturdays, Sundays, and national holidays. The fact that deliveries do not stall over weekends gives reassurance to customers who are in a hurry to receive their orders.
What to Do Next If an Item Is Flagged "Needs Caution" or "Ineligible"
Once the checklist indicates that an item cannot be sent via Click Post, your next step is to decide on an alternative service and your shipping fee allocation rules. Switching alternatives based on product unit price helps safeguard your profit margins while minimizing the risk of costly delivery accidents.
Decision Flow for Selecting Alternative Services
| Reason for Ineligibility | Primary Option | Secondary Option | Key Decision Factor |
|---|---|---|---|
| Thickness exceeds 3 cm | Yu-Packet 3 cm (360 yen) | Letter Pack Plus (600 yen) | Use Yu-Packet if under 1 kg, Letter Pack if heavier (from Oct 1, Click Post is also an option if under 60 cm total dimensions and mailable) |
| Weight exceeds 1 kg | Letter Pack Plus (up to 4 kg) | Yu-Pack | Courier is your only choice over 4 kg (from Oct 1, Click Post can be used up to 2 kg) |
| Compensation required (high value) | Yu-Pack (300,000 yen compensation) | Takkyubin (300,000 yen compensation) | Yamato for convenience store drops; Japan Post if dealing exclusively with the post office |
| Risk of breakage (glass, ceramics) | Yu-Pack (compensation + fragile handling) | Takkyubin (fragile designation) | Always use in combination with a 'Fragile' sticker |
| Cash on Delivery (COD) required | Yu-Pack (COD) | Takkyubin (COD) | Click Post does not support COD |
| Size exceeds A4 | Letter Pack Plus (A4 compatible) | Yu-Pack | Letter Pack takes priority for oversized items thicker than 3 cm |
Allocating Shipping Fees by Product Unit Price
Because alternative services cost more, standard fulfillment practice is to adjust how you charge shipping according to the product's unit price.
| Product Unit Price | Recommended Rule | Rationale |
|---|---|---|
| Up to 1,000 yen | Charge shipping separately to the buyer | Shipping represents a high percentage of price; bundling shipping destroys margins |
| 1,000 to 3,000 yen | Display separate shipping rates per service | Transparency helps buyers understand costs (e.g., "360 yen for Yu-Packet") |
| 3,000 to 5,000 yen | Absorb into a shipping-included price ceiling | Keeps checkout friction low to prevent cart abandonment |
| 5,000 yen and above | Free shipping (included in product price) | Buyers at higher price points take free shipping for granted |
For a deeper dive into unit prices and shipping display strategies, check out our guide: Free Shipping vs. Separate Shipping: Which Sells Better?.
Common Borderline Packaging Pitfalls and Fixes
- Package returned after measuring 3.1 cm post-packing: Slide your package through a shipping measurement ruler with a 3 cm slot (available at 100-yen shops) before dropping it off. If it clearly exceeds 3 cm, use Yu-Packet 3 cm from the start.
- Bundling multiple orders exceeds 3 cm: Ship items individually, or switch to courier pickup with convenience store pickup options.
- Packaging materials expand in rainy season or summer humidity: Re-measure packing material thickness seasonally, and leave a 1 mm safety margin for borderline products.
For practical tips on preventing moisture and transit damage, read our comprehensive guide: Click Post Packaging Basics to Prevent Rain Damage and Breakage.
Rate Comparison with Alternative Shipping Methods
To see how competitive Click Post's 185 yen rate (240 yen starting October 1) really is, let's compare it side-by-side with other major shipping services.
| Shipping Method | Rate | Tracking | Compensation |
|---|---|---|---|
| Click Post | 185 yen (240 yen from Oct 1) | Yes | No |
| Nonstandard-size mail (up to 50 g) | 140 yen | No | No |
| Nonstandard-size mail (up to 150 g) | 270 yen | No | No |
| Yu-Packet (within 3 cm) | 360 yen | Yes | No |
| Letter Pack Light | 430 yen | Yes | No |
| Letter Pack Plus | 600 yen | Yes | No |
For ultra-lightweight items under 50 g, nonstandard-size mail is cheaper. However, it does not include tracking. Among all shipping methods with tracking numbers, Click Post at 185 yen is the least expensive option (and holds the same competitive position even at 240 yen after October 1).
In my case, because most items I sell weigh over 50 g, Click Post provided the perfect balance between price and tracking capability. From my experience of using it over three years, simply having a tracking number dramatically cuts down on customer inquiries asking, "Has my order arrived?" The presence of tracking directly impacts your daily store workload far more than the minor difference in postage.
For more details on how to choose shipping methods, refer also to our comparison article on Click Post, Yu-Packet, Nekopos, and nonstandard-size mail.
Step-by-Step Guide to Verifying Click Post Eligibility for Your Products
- Pack the item: Actually pack the product using your intended envelope and cushioning materials.
- Measure the thickness: Confirm that the packaged item is within 3 cm. A shipping measurement ruler (available at 100-yen stores) is far more convenient than a standard ruler. (Starting October 1, confirm that total dimensions are within 60 cm, the longest side is within 34 cm, and the package can fit into a collection post box.)
- Weigh the package: Verify that the total weight, including all packaging materials, is within 1 kg (up to 2 kg starting October 1).
- Check the outer dimensions: Confirm that the package fits within 34 cm on the longest side and 25 cm on the shortest side (starting October 1, total three dimensions within 60 cm and longest side within 34 cm).
Judging eligibility by unpackaged product dimensions alone is a common trap—adding cushioning can easily push thickness past 3 cm. Always measure the finished, sealed package. In my early days, I assumed an item measuring 2 cm on its own would be fine, only to discover it expanded to 3.2 cm once bubble wrap was applied. Since then, post-packaging measurement has been a mandatory step for every shipment I make.
Frequently Asked Questions (FAQ)
Q. Can I ship food via Click Post?
Click Post can ship anything that is not classified as personal correspondence (shinsho) and does not contain explosives, toxic/hazardous substances, or other restricted goods. Ambient-temperature shelf-stable foods, such as baked cookies or dried fruits, can be shipped as long as they satisfy the size and weight limits. However, Click Post cannot handle items that require refrigeration or freezing.
Q. Can I use "Fragile" stickers? How should I ship breakable items with Click Post?
While you can physically apply a "Fragile" (Handle with Care) sticker to the package, Click Post delivery ends with mailbox drop-off, meaning there is no guarantee carrier staff will give it special fragile handling. Impact when dropped into the customer's mailbox and contact with other mail in transit cannot be avoided.
If you must send fragile items via Click Post, take the following packaging precautions:
- Double-wrap with bubble wrap: A single layer is rarely enough to absorb shocks; double-layer wrapping is the baseline for fragile items.
- Prevent movement inside the envelope: If the product slides around inside, damage risk increases sharply. Fill any empty space with paper or filler to lock it firmly in place.
- Pack assuming "This Side Up" labels will be ignored: Because packages are slipped through mail slots, pack with the assumption that the parcel will be turned upside down during handling.
If you still feel uneasy about high-value merchandise or delicate glassware, choosing services with compensation such as Yu-Pack (up to 300,000 yen compensation) or Takkyubin is far safer. As my personal rule of thumb, I avoid Click Post for any fragile item priced at 3,000 yen or more, opting instead for a shipping method with compensation.
Q. Can I bundle multiple items into a single Click Post package?
As long as the package stays within the official size and weight limits, you can bundle multiple items into a single shipment. For example, shipping three stickers and one keycap together in one envelope is entirely feasible. This keeps shipping costs down to a single fee, providing substantial value to customers who buy multiple items at once.
Q. How many packages can I ship at once with Click Post?
When using Click Post's bulk registration feature (CSV batch upload), the system caps each upload at 40 shipments. If you have more than 40 orders to process, you must split your file into multiple batches. For individual manual entries, there is no limit on total shipments.
Conclusion
Click Post is an outstanding shipping method for small, lightweight products fitting within 3 cm thickness and 1 kg weight (expanding to total three dimensions within 60 cm and 2 kg starting October 1). At a nationwide flat rate of 185 yen (240 yen from October 1), it includes package tracking and mailbox delivery. It is an ideal match for categories like accessories, stickers, cables, and small handmade crafts.
At the same time, you must keep in mind its limitations: no compensation for damage or loss, and no support for cash on delivery. Evaluating product characteristics, price points, and customer expectations will help you seamlessly switch between Click Post and other fulfillment channels.
Start by measuring your products in their fully packed state to see if they qualify for Click Post. If they meet the criteria, you can leverage it in your daily store operations as a cost-effective, reliable shipping method that keeps postage low while offering package tracking.
If you fulfill Click Post shipments for your Shopify store and want to streamline CSV exports and tracking number fulfillment updates, give Instant Shipping! for Click Post a try.
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