Does a Kakobuy rehearsal pay for itself?
A rehearsal costs $1.50 and pays for itself the moment it removes more than 0.18 kg of chargeable weight on the economy line — about 1.1 litres of empty box. If your parcel is already denser than its carton, the $1.50 buys information, not money.
Rehearsal is the one paid option in the warehouse that is arithmetic rather than convenience. The warehouse unpacks what the sellers sent, repacks it tighter, measures the sealed box, weighs it, and photographs it before you choose a shipping line. Nothing about the goods changes; what changes is how much air you are paying to fly.
What a rehearsal actually produces
Three things you did not have before: the packed dimensions in centimetres, the scale weight on a calibrated scale, and a photo of how the parcel was closed. Those three numbers are exactly the inputs to the chargeable-weight formula, which is why the option exists at all.
- Dimensions of the sealed box — not the listing size, not the seller's carton, the box that will actually be billed.
- Scale weight — the one number a rehearsal cannot fake, and the floor under every freight quote.
- A pre-seal photo — your only chance to object to how something was packed before it becomes a dispute about transit damage.
The formula, in one line
Chargeable weight is the higher of the two numbers: what the parcel weighs, and what its volume weighs. On the Economy air (consolidated) line the divisor is 6000, so one litre of box counts as 0.167 kg — and at $8.40 a kilo that is $1.40 of freight riding on every litre of empty space. Freight is then the first-kilo base of $12.50 plus $8.40 for each kilo after that.
Three parcels through the same arithmetic
Of the three below, 2 pay for themselves and one does not, and the one that fails is the parcel that was already dense. That is the shape of the decision: not "is rehearsal good", but "is there air left in this box".
| Parcel | Volume → chargeable | Freight | After $1.50 fee |
|---|---|---|---|
| Two pairs of sneakers, boxes in → boxes outThe shoebox is the classic payload: 250–350 g of cardboard and a lot of air. | 51.8 L → 8.64 kg 26.4 L → 4.40 kg |
$76.68 $41.06 |
+$34.12 4.24 kg removed |
| Hoodie, two tees, one cap, re-baggedFleece compresses well; the scale weight does not move, only the box does. | 21.3 L → 3.55 kg 15.0 L → 2.80 kg |
$33.89 $27.62 |
+$4.77 0.75 kg removed |
| Three pairs of socks, one phone caseNothing to remove: the parcel is already denser than its volume. | 3.0 L → 0.60 kg 3.0 L → 0.60 kg |
$12.50 $12.50 |
−$1.50 nothing to remove |
Freight is the economy line, first kilo $12.50 then $8.40 per kilo. The "after fee" column already subtracts the $1.50 rehearsal, so a positive number is money in your pocket and a negative number is a paid measurement.
The break-even, line by line
The fee is fixed and the per-kilo rate is not, so the break-even moves with the line. On the economy line $1.50 buys 0.18 kg; on a heavier express line the same fee buys less than half that, because each kilo is worth more.
| Line | Per kilo | Kilos to break even | Litres of box |
|---|---|---|---|
| Economy air (consolidated) | $8.40 | 0.18 kg | 1.1 L |
| Standard air (tracked) | $10.90 | 0.14 kg | 0.8 L |
| Express courier (DHL/FedEx class) | $15.50 | 0.10 kg | 0.5 L |
| Sensitive-goods air | $13.20 | 0.11 kg | 0.7 L |
Read the table the other way round on an expensive line: on the Express courier (DHL/FedEx class) at $15.50 a kilo, removing half a kilo is worth $7.75 — 5.2 times the fee.
When it cannot help
What you are billed is what it weighs
Books, tins, electronics, anything solid: the scale wins and the box is irrelevant. Paying $1.50 to confirm that is a paid measurement, and sometimes that is still worth it on a first haul — just call it what it is.
Compression has a cost
A shaped cap crown, a framed print, a shell jacket with a laminated membrane: saving $1.40 a litre is not worth a crease. Ask for padding in writing and accept the bigger box.
Customs is not watching the scale
Duty and import VAT are assessed on value plus freight. A lighter parcel trims the freight line and therefore the VAT proportionally — it does nothing about the goods value or the duty band.
What to write in the ticket
Four sentences get you a usable answer: measure the sealed box in centimetres, weigh it, tell me the chargeable weight on economy and on express, and photograph the parcel before sealing. Anything vaguer comes back as "about 4 kg", which is not a number you can plan with.
- Measure, do not estimate. "Please give me L × W × H of the sealed box in cm." Estimates lose to the tape measure at the counter.
- Ask for two lines, not one. The chargeable weight is the same; the divisor is not — 6000 versus 5000 changes the answer for anything bulky.
- Ask for the photo before sealing. After the seal it is a transit claim; before it, it is a request.
- Name what must not be compressed. One line is enough: "do not vacuum-pack the caps, the jacket" and the warehouse stops guessing.
Where to go next
Price the parcel yourself
Charged weight, every line rate, the landed number per destination.
What the rows cost
The price distribution the freight maths sits on top of.
The cheapest tier
Why a $3 item and a $300 item cost the same to fly.
Rehearsal questions, answered plainly
Does a rehearsal change what I pay in customs?
Only indirectly. Duty and import VAT are assessed on the goods value plus the freight you actually paid, so a cheaper parcel lowers the freight line and therefore the VAT by the same proportion. It cannot lower the goods value, and it does not touch the duty band the parcel sits in.
Can the parcel end up billed lighter than the goods themselves?
No. Chargeable weight is the higher of the scale weight and the volumetric weight, so the goods are the floor. A rehearsal can only remove the gap between the two — once a parcel is denser than its box, there is nothing left to win.
Is it worth paying for one pair of shoes?
Only if the box is doing the damage. One boxed pair usually lands near 1.40 kg of chargeable weight against roughly 0.95 kg box-free; on the economy line that gap is about $3.78, which clears the $1.50 fee but barely. Bundle the shoes with the rest of the haul and decide once, not per item.
How much volume can actually come out?
Usually 15–35% on a clothing haul, less on boxed shoes and almost nothing on dense goods like books, tins or electronics. Treat any bigger number you read elsewhere as a sales claim: the ceiling is set by what the item physically is.
Can re-packing damage my order?
It is the real trade-off. Compression helps fleece and hurts anything with a shell, a frame or a glass panel. Ask for padding in writing on the items that need it, and do not ask for vacuum compression on structured bags or caps with a shaped crown.
What should I actually ask the agent for?
Four things: the packed box measured in centimetres, the scale weight, the chargeable weight for the economy and express lines, and a photo before the parcel is sealed. With those four numbers you can price the parcel yourself instead of trusting a quote.