Most of what I've launched lately is a bundle or a multi-pack: a Stadium Comfort Pack with a clear stadium-approved bag, a seat cushion, and a rain poncho; a travel sleep set with a contoured eye mask and earplugs; toothpaste tube squeezers in a 2-pack and a 4-pack. That's not an accident. On marketplaces with flat fulfillment fees, selling cheap things one at a time is one of the hardest ways to make money.
Why cheap items lose
Amazon FBA and Walmart WFS charge a fulfillment fee per unit shipped, set by size and weight. It doesn't matter if the unit sells for $8 or $38. A small item costs a few dollars to ship either way. On a cheap item, that fixed fee is a huge share of the price.
Walmart adds an extra layer: a $1.00 surcharge on WFS items with a total price under $10. On a $9.99 item, Walmart's referral fee plus WFS fee plus surcharge comes to $5.95, about 60% of the price, before you pay for the product.
My tube squeezers: 2-pack vs 4-pack
On my Shopify store I sell the tube squeezers as a 2-pack at $9.99 and a 4-pack at $12.99. Here's what each would look like on Amazon FBA and Walmart WFS. The item cost here is an assumed $0.75 per squeezer landed, so you can see the effect of pack size clearly.
| 2-pack, $9.99 | 4-pack, $12.99 | |
|---|---|---|
| Amazon referral (15%) | $1.50 | $1.95 |
| FBA fulfillment, small standard | $2.42 (low-price rate) | $3.50 |
| Item cost | $1.50 | $3.00 |
| FBA profit per order | $4.57 | $4.54 |
| Walmart referral (15%) | $1.50 | $1.95 |
| WFS fulfillment | $4.45 (incl. $1 surcharge) | $3.45 |
| Item cost | $1.50 | $3.00 |
| WFS profit per order | $2.54 | $4.59 |
Two different stories:
- On Amazon, the 2-pack benefits from Amazon's low-price fulfillment rate for items under $10, so both packs earn about the same per order. The 4-pack is a better deal for the buyer (each squeezer is $3.25 instead of $5.00) at no cost to me. That's a conversion tool, not a margin tool.
- On Walmart, the 2-pack gets hit with the under-$10 surcharge and the 4-pack doesn't, so the 4-pack earns 80% more per order. On WFS, the 4-pack should be the main listing.
Same products, same prices, opposite conclusions on two platforms. That's why it's worth running the numbers per platform instead of assuming.
Bundles: one fee instead of three
A bundle combines different, related products into one unit. The fee math works the same way: three items in one box pay one fulfillment fee and one referral fee on one price. Here's a stadium kit at illustrative prices, sold separately versus as one bundle on FBA:
The buyer pays $4.98 less and you keep $2.40 more, because Amazon's fees drop by $7.38.
That's the core of why bundles work: the buyer gets a discount and a ready-made kit, and the fee savings pay for the discount with room left over. It also helps on the listing side. A "stadium comfort kit" is a different search than "clear bag," with fewer identical competitors.
How to price a multi-pack or bundle
- Start from what buyers compare it to. For a multi-pack, that's buying your smaller pack twice. For a bundle, it's buying each item separately, on your listings or a competitor's.
- Give a visible discount. The bigger pack's per-item price should be obviously lower. The 4-pack at $12.99 is $3.25 per squeezer versus $5.00 in the 2-pack. That's easy to see.
- Run both through the calculators on every platform you sell on. Look at profit per order and margin, not just price.
- Check the thresholds. Walmart's $10 surcharge line, Amazon's clothing and beauty referral tiers, Amazon's under-$10 fulfillment rate, and weight bands. A good bundle price lands on the right side of each.
- Watch the weight. Adding items can push a bundle into a heavier band or a bigger size tier. The stadium kit above jumps to the 2 to 2.25 lb band, which is still far cheaper than three separate fees.
Practical details
- Each pack size is its own product. It needs its own listing and its own barcode or GTIN exemption.
- Images need to match the pack. If your main image shows four items and the buyer ordered two, expect "missing items" complaints. I use a different main image for each variant on my store, and the supporting images avoid showing a count at all.
- Bundle the inventory before it ships in. Amazon and Walmart need each bundle as one sealed, labeled unit, usually with a "sold as set, do not separate" label.
- Keep random colors honest. If items ship in assorted colors, say so in the title or images. Mine say "colors ship at random" on an image and in the description.
Questions people ask
Why sell a multi-pack instead of a single item?
Because fulfillment fees are charged per unit shipped, not per item inside. A 4-pack ships as one unit, so you pay one fulfillment fee and one per-order fee while charging a higher price. It also gets low-priced items over thresholds like Walmart's under-$10 surcharge.
How should I price a multi-pack?
Price it so the buyer clearly saves versus buying singles, while your profit per order goes up. A common approach is pricing the larger pack well below 2x the smaller pack's price. Run both through a fee calculator to make sure the bigger pack actually earns more per order.
Do I need a new barcode for a bundle or multi-pack?
Yes. On Amazon and Walmart a multi-pack or bundle is its own product with its own listing and its own GTIN (or exemption). You can't sell it under the single item's barcode.
Are there rules for bundles on Amazon?
Yes. Amazon requires bundles to be made of complementary items, sold as one unit, and listed as a new product rather than added to an existing single-item listing. Check Amazon's product bundling policy for your category before you create one.