Combining shipping means one buyer's several wins travel in one box under one label. On our test lane the difference is stark: three paperbacks sent as three parcels came to $29.73, while the same three in one 2 lb box quoted $8.48.
The saving is real and it is bigger than most sellers guess. It is also easy to overshoot if you upsize the carton.
One buyer, three paperbacks. Sent separately that is three labels; sent together it is one box and one label. We priced both on the same lane on the same day.
| Order | One box | Weight | Cheapest quoted | Sent separately | Kept back |
|---|---|---|---|---|---|
| 1 book | 8 x 5 x 1.5 in | 1 lb | $9.91 | $9.91 | nothing to save |
| 2 books | 12 x 9 x 4 in | 2 lb | $8.48 | $19.82 | $11.34 |
| 5 books | 12 x 10 x 6 in | 5 lb | $13.52 | $49.55 | $36.03 |
The two-book row is the one sellers misjudge. Combining did not merely halve the cost, it came in below the price of a single book on its own, because the second parcel moved the shipment into a box and weight band that happened to price better. The five-book row was cheapest on UPS Ground Saver, which returned no transit window with its rate, so we are not printing one.
The time period setting is the one people leave at its default and then wonder why a Friday and a Sunday purchase never merged. Set it to match how you actually pack, not to the shortest option in the list.
The discount you offer is a promise made before you know the number. Thirty seconds with the packed dimensions turns that promise into arithmetic, and the gap between a guess and the real figure is usually larger than the discount itself.
Stacking two orders into one carton can cross into a bigger box and a worse price even as the weight barely moves. Our own ladder shows a 5 lb box at 12 x 10 x 6 in quoting $13.52 while the identical 5 lb in a 24 x 18 x 14 in box quoted $36.75 on the same lane and day.
SMKlog has no eBay integration. We do not read your orders, we do not push tracking back into a listing, and we do not do fulfillment. If you buy a label here, you paste the tracking number into eBay yourself. Buying through eBay Labels uploads tracking automatically instead, which is a genuine convenience worth weighing.
Turn on invoice requests first: eBay's help says to open Shipping Preferences, edit Allow invoice requests, set requests allowed to yes and pick the time period you will combine across. The buyer then selects Request combined shipping in their cart, and you send one invoice covering the lot.
On our 2026-07-28 lane from Newark to Atlanta, one paperback quoted $9.91, so three sent separately would be $29.73. The same three packed into a 12 x 9 x 4 in box at 2 lb quoted $8.48. Five in a 12 x 10 x 6 in box at 5 lb quoted $13.52 against $49.55 sent one by one.
eBay lists situations where the cart cannot ask, covering items whose price is already reduced, listings that offer shipping at no charge, and listings that require immediate payment. Where the request is blocked, eBay's suggested route is a partial refund from Orders after the buyer has paid.
No. There is no integration, no order sync and no fulfillment service here. You quote the packed box, buy one US domestic label as a guest, and copy the tracking number into eBay yourself.