Does the supplier MOQ force you to overbuy the bundle?
because a 5,000-unit MOQ on an unproven 2-pack is the inventory version of the tier trap. Test with a virtual bundle first when you can.
It reads your own order reports to find what customers already buy together, prices the combined box against the 2026 fee schedule, and routes each idea to the right build: true bundle, virtual bundle, or multipack child. GO or NO-GO, before the purchase order.
Bundle math fails in the box, not on the listing. Combine two profitable units and you can manufacture an unprofitable one.
Amazon prices fulfillment by size tier, and tiers are cliffs, not slopes. A package that fits inside 15 x 12 x 0.75 inches and weighs a pound or less is small standard. Go past any one of those numbers, by any amount, and the whole unit is billed at the next tier.
We sell the same kitchen product in several colorways. Same function, same $11.99 price. One colorway packs to 0.71 inches thick. Another packs to 0.83. Amazon ships the thin one for $3.50 and the thick one for $4.76. That is $1.26 a unit, every unit, for twelve hundredths of an inch. Both numbers are pulled straight from our own Fee Preview report, not from a rate card.
Now picture the 2-pack. Stack two units in one box and the dimension that doubles is the thin one, which is exactly the dimension most likely to cross 0.75 inches. The bundle you sketched at a lower fee per unit can land at a higher fee per unit than the singles it replaced.
| Size tier | Must fit inside | Weight cap | Fulfillment fee |
|---|---|---|---|
| Small standard | 15 x 12 x 0.75 in | 1 lb | $3.32 to $3.96 |
| Large standard | 18 x 14 x 8 in | 20 lb | $3.73 to $6.97, then $0.08 per 4 oz over 3 lb |
| Small bulky (new for 2026) | 37 x 28 x 20 in | 50 lb | $7.55 + $0.38 per lb after the first |
| Large bulky | 59 x 33 x 33 in | 50 lb | $9.35 + $0.38 per lb after the first |
US non-peak rates effective January 15, 2026, verified against Amazon's fee pages on July 4, 2026. Fees shown are the $10 to $50 price band, before the 3.5% fuel and logistics surcharge Amazon added on April 17, 2026. Non-apparel, non-hazmat. Extra-large tiers exist above these; if your consumable bundle is anywhere near them, the answer is already no. The calculator applies the surcharge and the price bands for you.
Once a package leaves small standard, Amazon bills the greater of its actual weight and its dimensional weight (length x width x height, divided by 139). Our 0.83-inch colorway weighs 0.15 pounds on a scale, but length times width times thickness divided by 139 comes to 0.98 pounds, so Amazon bills it as a one-pound package. The tier flip and the dimensional-weight flip usually arrive together. That is how $3.50 became $4.76.
Fulfillment fees now come in three price bands. Under $10, items ship on Low-Price FBA rates, $0.86 less per unit on average. Over $50, standard-size items pay a little more. Bundle two $6 items into an $11 offer and you hand back the low-price discount on the whole package; push a bundle past $50 and the fee steps up again. Referral has its own version: Grocery runs 8% up to $15, and Beauty, Health and Baby run 8% up to $10, all flipping to 15% above the line. A bundle that crosses a band pays the new rate on the entire price. The calculator on page 05 handles the fulfillment bands automatically.
A bundle is not one thing on Amazon. It is three different builds, and they are not interchangeable.
| True bundle | Virtual bundle | Multipack child | |
|---|---|---|---|
| New inventory to buy | yes | no | yes |
| Brand Registry required | no | yes | no |
| Cuts fulfillment fee per unit | yes | no | yes |
| Inherits your reviews | no, fresh page | no, fresh page | yes, shared |
| Competitors can price-match it | hard | no | easy |
| Time to live | weeks (PO first) | no PO to wait on | weeks (PO first) |
If you are brand-registered, the order of operations is: virtual first, true bundle second. The virtual bundle puts a real bundle page live this week with zero inventory risk. If it sells, you have proof of demand before the PO, and the true bundle earns the fee savings the virtual version cannot. If it does not sell, you found out for free.
Work down the map. The first yes is your answer.
Measure the box before you write the listing.then let the calculator judge it
Give it the components and a target price. It gives you a verdict.
It already holds a worked example, a 2-pack of an $11.99 kitchen item, so you can see it move before you type anything. The fee engine underneath runs Amazon's published 2026 US rate card (effective January 15), applies the 3.5% fuel surcharge from April 17, picks the right price band, and bills dimensional weight where Amazon does.
| Component | Qty in bundle | Unit COGS $ | Solo price $ | Solo FBA fee $ |
|---|
You are reading the print version. Open the HTML file in a browser and this page becomes a working calculator: type in components, dims and a price, and it stamps GO or NO-GO using Amazon's 2026 US rate card. Page 08 shows two full worked examples of exactly what it computes.
These are the published non-peak rates; from October 15 to January 14 Amazon charges higher peak fulfillment rates, so a holiday bundle should clear the floor with room to spare. And the final word on any fee is Amazon's own Revenue Calculator against your real, taped-up prototype. This tool exists so that only ideas worth prototyping get prototyped.
Your order history already knows what belongs together. Two files in, three answers out.
Waiting for your order file. Every pair of products bought in the same order 3 or more times gets listed, with how often they attach and how far above chance the pairing runs.
Same file. Every SKU customers buy 2 or more at a time in 3 or more orders, ranked by how often it happens.
Waiting for a file. Every SKU in your report will be listed, ranked by the fulfillment fee a 2-pack saves per unit (or by real dollars saved in your window, once the matchmaker above has your order file).
In the browser version, this page reads your All Orders report and lists what your customers already buy together (bundle candidates, with attach rates) and what they buy in multiples (multipack candidates). Add your Fee Preview report and every candidate gets priced: current fee, the tier a 2-pack lands in, the fee saved per unit, and the dollars that adds up to in your own order window.
The simulated 2-pack stacks the package along its thinnest side, adds a small packaging allowance, and prices at 1.9x solo (change the multiplier if you price differently). Some SKUs come back from Amazon with no dimensions on file; the tool marks those measure it yourself instead of guessing. When we ran our own 110-SKU report through it, 43 rows had no dims. Amazon's data is a starting point, never the PO.
A bundle that cannot show all three of these is a discount wearing a costume.
Stack the actual units, bag or box them the way the factory will, and measure all three sides and the weight. Estimated dims are for screening; measured dims are for money.
If the verdict changed between the estimate and the tape measure, believe the tape measure.
Run the measured package through the Revenue Calculator (sellercentral.amazon.com/revcal). Amazon also ships a Fee and Economics Preview report and a SKU Economics report if you want the per-SKU history. Their number outranks everything, including this tool.
True bundle: its own UPC, never a component's barcode. Multipack child: confirm your category offers a quantity-style variation theme before you plan around one. Virtual bundle: Brand Registry, 2 to 5 of your own brand's FBA ASINs, US store.
One-box bundles and multipacks get sealed as a single unit and labeled with Amazon's recommended wording: "Sold as Set" or "This is a Set, do not separate." An unlabeled bundle risks being received and sold as singles.
Same product, same box, same fees. The price decides the verdict.
The component is a hypothetical with honest proportions: an $11.99 kitchen item that packs to 8.4 x 3.8 x 0.28 inches at 0.13 lb, with $1.40 landed COGS and a $3.54 solo fee off the 2026 rate card. The 2-pack stacks to 8.4 x 3.8 x 0.6 inches at 0.28 lb, stays small standard, and picks up $0.25 of prep. Referral is 15%. Everything below comes out of the calculator on page 05.
| Per order | The 2-pack at $19.99 | Same units, sold separately |
|---|---|---|
| Size tier | Small standard (4+ to 6 oz band) | as-is today |
| Revenue | $19.99 | $23.98 |
| Referral at 15% | $3.00 | $3.60 |
| Fulfillment | $3.57 | $7.08 |
| COGS + prep | $3.05 | $2.80 |
| Net proceeds | $10.37 | $10.50 |
| Margin | 51.9% | 43.8% |
| Fulfillment fee as % of price | 17.9% | 29.5% |
| Per order | The 2-pack at $15.99 | Same units, sold separately |
|---|---|---|
| Size tier | Small standard (4+ to 6 oz band) | as-is today |
| Revenue | $15.99 | $23.98 |
| Referral at 15% | $2.40 | $3.60 |
| Fulfillment | $3.57 | $7.08 |
| COGS + prep | $3.05 | $2.80 |
| Net proceeds | $6.97 | $10.50 |
| Margin | 43.6% | 43.8% |
| Fulfillment fee as % of price | 22.3% | 29.5% |
The box behaved both times. What flipped the verdict was the discount. At 17% off two singles, the 2-pack keeps the fee win and 98.8% of the margin dollars. At 33% off it still shows a respectable 43.6% margin on paper, and it is still a NO-GO, because the same two units earn $10.50 sold separately and only $6.97 in the bundle. The trap is not always the tier line. Sometimes it is the discount.
Take our 0.71-inch colorway from page 02. Stack two and the package passes 0.75 inches: large standard, dimensional weight, the works. Run it through the calculator and the 2-pack fee comes back $5.76 against $7.00 for shipping two singles: even with the tier bump, the one-box build saves $1.24 an order. The tier trap does not always kill the bundle; it changes the price you need to charge. That is why you run the numbers instead of the vibes.
Build the SKU on this page first. The inventory can wait a week.
Every bundle idea wants to skip straight to the PO, because the PO feels like progress. The validator is the slower, cheaper version of finding out. Ten minutes with the calculator, one Fee Preview import, one taped-up prototype, and you know whether the idea deserves real money.
If it does: virtual first when you are eligible, true bundle or multipack child when the demand is proven, and a prep label that keeps the set together. If it does not, you just saved yourself a pallet of inventory that would have taught you the same lesson slower.