Every Litbuy AI order opens with a number that looks like a shipping price and behaves like a placeholder. On the first consolidated parcel we ordered and tested this autumn, the app showed $20.35 for shipping before packing; the courier invoice for the same three garments came in at $49.35, and the whole bill landed 49.2% above the estimate we screenshotted. Nothing underhanded happened. Four separate lines did the damage, and only one of them was the rate per kilogram.
The short answer
The estimate is built from seller-declared item weights with no carton dimensions. The invoice is built from chargeable weight after packing, plus taxes the pre-packing screen never itemises. On our parcel that adds up completely:
- Chargeable weight, +$29.00. Estimated 1.0 kg, billed 3.0 kg.
- Destination VAT, +$14.72. Dutch VAT at 21% appeared only at parcel payment.
- Currency and add-ons, +$7.63. Two currency spreads plus extra QC photos.
- Coupon, −$5.24. The 40% voucher applied to the first weight tier only.
Our invoice, line by line
| Line | Estimate, 15 Aug | Invoice, 19 Aug | Change |
|---|---|---|---|
| Chargeable weight | 1.0 kg | 3.0 kg | +2.0 kg |
| International shipping, duty-included line | $20.35 | $49.35 | +$29.00 |
| First-weight coupon, 40% | not shown | −$5.24 | −$5.24 |
| Destination VAT, 21%, IOSS | not itemised | $14.72 | +$14.72 |
| Item subtotal, three garments | $66.53 | $66.53 | $0.00 |
| Domestic shipping, two sellers | $3.56 | $3.56 | $0.00 |
| Agent service fee | $3.33 | $3.33 | $0.00 |
| Currency spread, USD → CNY, 6.2% | not shown | $4.14 | +$4.14 |
| Card issuer FX, EUR → USD, 1.9% | not shown | $1.26 | +$1.26 |
| Extra QC photos, 3 × CNY 5 | not selected | $2.23 | +$2.23 |
| Total charged | $93.77 | $139.88 | +$46.11 |
Where the extra two kilograms came from
Our calibrated 0.5 g scale and a tape measure explain the whole gap. Unwrapped on the grey card before anything was worn:
- Three garments: 1,016.5 g total. The Ami Paris heart-print zipper hoodie in size L was 612.0 g of that — consistent with the 350–400 g/m² cotton terry the listing claims.
- Packaging: corrugated board 186.0 g, void fill 96.0 g, two inner bags 31.5 g, four corner protectors 24.0 g — 337.5 g.
- Packed actual weight: 1,354.0 g.
- Carton as taped: 40.0 × 30.0 × 12.0 cm = 14,400 cm³.
- Volumetric weight at the line's divisor of 5,000: 2.88 kg.
The line bills the greater of actual and volumetric weight, rounded up to the next half kilo. 2.88 kg became 3.0 kg — 2.2× the physical weight of the parcel, for a garment box that was mostly air.
Why the divisor matters more than the rate per kilogram
IATA air freight uses a divisor of 6,000. Express couriers and most consolidator lines use 5,000, which inflates volumetric weight by 20% on the same carton. At 6,000 our box would have computed 2.40 kg and billed 2.5 kg — one tier cheaper, $7.25 less. Comparing quoted prices per kilogram between lanes is close to meaningless until you apply each lane's own divisor to your own dimensions.
The two currency spreads you only count once
We topped up from a euro account, so the money converted twice. Our wallet credited at CNY 6.32 per USD against a mid-market 6.74 on the payment date — a 6.2% spread — and the card issuer took 1.9% going EUR → USD. Combined, 8.1% of item value, or $5.40, disappeared before a parcel existed. Published rate trackers put agent spreads anywhere from roughly 1% to 8% depending on platform and week, so this line is worth measuring once on your own top-up screen rather than assuming.
What the 40% coupon actually took off
The welcome voucher discounted the first weight tier only: 40% of $13.10 — $5.24 — not 40% of the $49.35 line. On a 3.0 kg parcel the effective discount was 10.6%. Coupons are worth chasing, but they devalue exactly as the parcel gets heavier, which is when the estimate-to-invoice gap grows.
The duty-included line was the one thing that helped
Our route was a duty-and-tax-included dedicated line. Re-quoting the identical 3.0 kg carton on the same lane without inclusion gave $47.90, so inclusion cost $1.45. Paying at the door instead would have meant €6 of EU duty — two declaration lines under the flat €3-per-line duty that replaced the €150 exemption on 1 July 2026 — plus a postal clearance fee near €6. That is roughly $12.98 to save $1.45. Two caveats: duty cannot be paid through IOSS and is not refunded if you return the goods.
True landed cost of one hoodie
Allocating value-based lines by item price and weight-based lines by scale weight, the Ami Paris heart-print zipper hoodie from the product catalog — listed at $34.03 — landed at $75.54:
| Line | Basis | Amount |
|---|---|---|
| Item price, at mid-market | — | $34.03 |
| Domestic shipping to warehouse | 51.2% of $3.56 | $1.82 |
| Agent service fee | 51.2% of $3.33 | $1.70 |
| Currency spread, USD → CNY | 51.2% of $4.14 | $2.12 |
| Card issuer FX, EUR → USD | 51.2% of $1.26 | $0.64 |
| Extra QC photos | 51.2% of $2.23 | $1.14 |
| International shipping, net of coupon | 60.2% of $44.11 | $26.56 |
| Destination VAT, 21% IOSS | 51.2% of $14.72 | $7.53 |
| Landed cost, one hoodie | — | $75.54 |
A 2.22× multiplier, and 54% of a $139.88 parcel for one garment that carried 60% of the weight and triggered most of the volumetric billing.
Keeping the gap small on the next order
- Budget on dimensions, not weights. A carton you can already estimate at 40 × 30 × 12 cm prices predictably; a declared item weight does not.
- Pair bulky with dense. Air-filled volume is what converts to billable kilos, so squeeze light garments against heavier ones instead of shipping them alone.
- Authorise packaging removal before you submit, then confirm the new dimensions in the packed-parcel preview.
- Top up once, in one currency, through a low-FX route, so you pay the agent's spread without a card issuer's markup stacked on it.
- Read the coupon terms. Percentage-off-first-weight and percentage-off-total are not the same offer at 3 kg.
- Cross-check the printed dimensions against your own tape. Ours differed, and that difference is logged.
Correction candidate: the invoice printed 41.0 × 30.5 × 12.0 cm (15,006 cm³, 3.00 kg) against our taped 40.0 × 30.0 × 12.0 cm — a 4.2% dimensional variance, above our 2% threshold, though both figures bill at 3.0 kg. We are re-measuring the next ten parcels. On the five-point scale we apply to every order, this parcel's landed-cost outcome scores 3.5 / 5: the duty-included line and free corner protection were genuinely good, while a pre-packing estimate that understated chargeable weight by two kilograms was nowhere near adequate.
