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A shipping label is a map of your parcel's journey. The tracking number identifies the parcel, the service line names the speed, the weight and size blocks decide what you paid, and the sender and recipient blocks tell the carrier where it came from and where it goes. The barcode carries the tracking number in a form machines can read.
Every carrier lays its label out a little differently, but the same blocks appear on nearly all of them. Once you know what each block is for, any label becomes readable:
| Block | What it says | Why it matters to you |
|---|---|---|
| Service line | The service level, such as Xpresspost, Priority, or standard parcel | Sets the speed and handling your parcel gets |
| Tracking number | A long code, usually digits, sometimes with letters | The key to tracking and to any claim |
| Barcode | The tracking number encoded as bars | What scanners read at every depot |
| Recipient block ("Ship to") | Name, street address, city, province or state, postal or ZIP code, country | Where the parcel is going; sorting reads this, not the name |
| Sender block ("From" / return address) | Your name and address | Where the parcel returns to if delivery fails |
| Weight and size | Actual weight, and sometimes dimensions or billed weight | What the price was based on |
| Date and origin | The date the label was bought and the depot or postal code it shipped from | Shows where the clock started if a parcel stalls |
| Routing codes | Short codes or a second smaller barcode near the destination | Tells each depot which truck or route the parcel belongs on |
The tracking number is the parcel's identity. Every scan along the route, from acceptance at the counter to out-for-delivery, is logged against that number. Type it into the carrier's tracking page and you see the same scan history the carrier's staff see. If you ever need to ask about a parcel, give the tracking number first: it is the only detail the carrier's system can search by.
Two details catch people out. First, tracking numbers are carrier-specific: a Canada Post number will not work on a courier's tracking page, and a US carrier's number will not work on Canada Post's site. Second, tracking usually starts only at the first scan, which can lag the drop-off by hours, so a label showing no activity yet does not mean the parcel is lost.
The service line is the promise you bought: the speed tier, such as Xpresspost in Canada or an express or ground tier in the US. It also decides which network the parcel travels on, so two parcels to the same address can take different routes if they were bought at different service levels. If a label's service line does not match what you paid for, flag it before the parcel leaves your hands, since fixing it after drop-off is much harder.
The weight line deserves a second look. Carriers charge on the greater of actual weight and dimensional weight, a formula based on the box's size, so a light but bulky box can be billed as heavier than the scale says. If the billed weight looks wrong, check the dimensions on the label too: a typo in one dimension can inflate the whole charge.
The recipient block is the one the sorting system cares about. Automated readers scan the postal or ZIP code and the street address, and they largely ignore the person's name. That is why a correct postal code with a misspelled name still usually arrives, while a correct name with a wrong postal code can wander. If a parcel arrives at your door by mistake, the recipient block tells you whether it was misaddressed or misdelivered: wrong address means the sender's error, right address means the carrier's.
The sender block doubles as the return address. If delivery fails, the parcel comes back to that address, and if the sender block is missing or wrong, an undeliverable parcel can end up in the carrier's dead-letter stream instead of coming home. When you buy a label through an assistant, check that the sender block shows the address you want returns sent to.
It should not, and when it seems to, the cause is usually one of two things. First, many labels carry more than one barcode: the big one is the tracking number, while a smaller one encodes routing or service data, and the numbers under the small barcode are not meant to match the tracking number. Second, a damaged barcode can scan as a different parcel, which is why a torn label is a real problem even when the printed text is still readable. Machines follow the barcode, so a label with a damaged barcode should be reprinted before drop-off, not taped over.
Run through this short check while the parcel is still in your hands. First, confirm the recipient's postal or ZIP code digit by digit: one wrong digit sends the parcel to the wrong depot. Second, confirm the service line matches what you paid for, and check weight and dimensions against what you measured. Third, make sure the barcode is clean, flat, and unscratched. Put the label on the largest flat side of the box so nothing folds over the barcode. Finally, photograph the label before drop-off: if the parcel goes astray, that photo gives you the tracking number, the service, and the date.
One more habit worth building: keep the tracking number somewhere outside the parcel, such as a note on your phone or the email receipt. The label travels with the parcel, so if the parcel is lost, the label is lost with it, and your copy is the only way back to the record.
Ready to ship it? Get a shipping label with LetterAgent: describe it to your AI assistant, approve the exact quoted price, and get your label.
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