303: How To Sell Oversized Goods And Manage Your Supply Chain With Liz Mercer

Podcast: Download (Duration: 42:30 — 48.9MB)

Selling oversized products on Amazon works when your supply chain is precise enough to survive an 18% gross margin. Liz Mercer runs Sleekform, a seven figure ergonomic furniture business, where one product fits only 380 units in a 40-foot container and reordering happens three weeks before the previous shipment even reaches Amazon.

Liz helped start Jungle Scout with her husband Greg, running operations behind the scenes, then left to build Sleekform on her own. She sells kneeling chairs and ergonomic furniture at price points most competitors cannot match.

This episode covers container loading, box sizing traps, lead times, IPI scores, launching furniture without discounting, and why she runs the whole operation with a team of three.

Key takeaways

• Her target is an 18% gross margin after Amazon fees and PPC, on chairs priced under $150.
• One product fits 380 units per 40-foot container, with reorders placed three weeks before arrival.
• Floor load rather than palletize to maximize units per container, then palletize stateside if needed.
• Box size determines your oversized tier. An unnecessarily large box moves you to much higher fees.
• Lead times average 60 days in China plus 30 days for boat and customs.
• Going out of stock beyond 14 days means starting rankings from scratch.
• An IPI score below 400 caps your FBA storage, which is brutal for oversized inventory.
• Launch furniture with aggressive PPC, not discounts, since giving away oversized product is impossible.

How Liz Mercer went from Jungle Scout to selling furniture

Liz ran operations at Jungle Scout while Greg took the customer-facing role, handling team creation, retreats, customer service, and the behind-the-scenes work.

After a few years she wanted to find out whether she could succeed or fail on her own, and learn the skills Greg was good at.

Furniture was a natural fit. She had been selling products on Amazon already, and she describes herself as a nerd for office organization, the kid who loved new pens at the start of a school year.

The ergonomics angle came from personal experience. She and Greg were digital nomads at the time, her setup was far from ergonomic, and she was in a lot of pain.

How to design furniture without a design background

Liz started by working from manufacturers’ existing designs and modifying them based on customer feedback.

The changes were small at first. Whether people wanted a backrest, whether the incline was right, whether the cushion was too thick or thin, how the wheels performed.

Amazon reviews were the entire research pipeline, and with a Jungle Scout background that information gathering was seamless. No other platform puts customer feedback in front of you that directly.

Once she moved back to Austin she started working with a product designer in Portland who had an ergonomic background.

Her working definition of ergonomics is furniture built to fit your body rather than a body forced to fit the furniture. They pulled data across many body sizes and shapes to maximize comfort in a single chair sold to many people.

Why box size matters more than you expect on oversized FBA

Amazon handles all of Sleekform’s fulfillment, including orders placed on the Shopify store, because the fulfillment game is hard enough that few players compete in it.

That means oversized fees and shipping only to the specific warehouses that accept oversized items.

The logistical difficulty is also the moat. Fewer competitors operate in oversized categories on Amazon precisely because it is harder.

The trap is box dimensions. Manufacturers sometimes want to use a larger box they happen to have on hand, unrelated to protecting the product, and that larger box can push you into a different oversized tier with significantly higher fees.

How to maximize units per shipping container

Liz ships in full containers, with the unit count derived mathematically from how fast each product sells.

Early on she accepted the supplier’s word on container capacity. Now she drills into exactly how many inches are needed on every side to fit the maximum number of units.

The bigger lever is floor loading rather than palletizing. Floor loading fits more units per shipment, and she palletizes after arrival in the United States only if it is required.

How to time reorders around long lead times

Production in China averages 60 days, with roughly 30 more days between the boat and clearing customs to reach Amazon.

Factory variation is wide. Some produce within 45 days and others take 75.

The reorder calculation combines that lead time with sell-through. For the product limited to 380 units per container, the next order has to be in production about three weeks before the current shipment even reaches Amazon.

Other products sell out within 90 days of arriving, which is roughly Amazon’s sweet spot. Matching that turnover against your supply chain lead time is what determines the reorder date.

What margins oversized ecommerce actually needs

Liz targets 18% gross margin, after Amazon fees and pay-per-click costs.

That is deliberately lower than what other furniture sellers work with, because she wants to offer products that have historically been expensive at a price people can afford.

Kneeling chairs have existed in Europe for a long time at $300 to $500. Her goal is $150 or less, so buyers can try one without being out $500 if they dislike it.

Eighteen percent is what keeps the doors open and the reorders flowing without leaving her exposed.

How to launch a furniture product on Amazon

Discounting heavily to launch does not work when the product is large and expensive to ship.

Her first choice is parent-child listing a new chair under an existing one, inheriting that listing’s demand and credibility.

For a genuinely new product with no parent, the approach is heavy targeting and sponsored ads leveraging the Sleekform brand.

Pricing stays competitive rather than discounted, and the aggression goes into PPC. That advertising cost is already inside the 18% margin target.

Why Chinese sellers can undercut US oversized sellers

Competition in kneeling chairs went from Liz plus one other seller two years ago to about five main players.

Chinese sellers have learned to sell on Amazon well and can price significantly below her.

Part of that is cutting out the middleman by selling directly to Amazon rather than through a US importer.

The other part, based on what sellers report rather than firsthand knowledge, is tariff declarations. A product declared at $15 to the US government carries a very different duty burden than the same product declared at $100, and enforcement against overseas declarations is limited.

Why an Amazon brand needs its own website

Sleekform started Amazon-only, and Liz built the website as competition increased.

Her reasoning came from her own buying behavior. Shopping on Amazon for an unfamiliar brand, she would check Instagram or the company’s website to verify it is a real business she could contact directly if something went wrong.

That led to a blog, a Squarespace site, then Shopify, plus Facebook and Instagram presence, all to make the brand feel real.

The competitive gap is striking. Most of her Amazon competitors have no website at all, and one that does sells kitchen tools alongside kneeling chairs and tables.

Amazon still accounts for 95% of sales, which is why she can move the business substantially by adjusting Amazon levers.

How Sleekform uses Instagram for ergonomics content

Liz’s Instagram strategy is educating people about posture rather than selling chairs.

The timing works because the wellness movement has people’s attention right now, so useful information about ergonomics finds an audience.

Her content covers why posture matters, what you can do to improve it, and how your seated position affects productivity at work.

The framing is that most of us live sedentary lives working from a seated position. She cannot change that, and she can make the sitting better, whether the chair is hers or someone else’s.

How to work with micro influencers on furniture

Liz’s sweet spot is influencers with 25,000 followers or fewer, and three partnerships have genuinely worked out.

Open-ended arrangements failed. Sending a chair and asking someone to post whenever they feel like it produces nothing.

Excessive formality fails on the other end, with too many contract line items killing the deal. The workable position sits between those extremes.

What works best is letting influencers approach her first, then building the relationship from there rather than cold outreach.

The contract exists mostly for supply chain reasons. If a post sells 500 units instead of an expected 50, that has to be absorbable, so she has influencers review their own history and analytics to forecast. That analysis has been genuinely useful to the smaller influencers too.

Forecasting stays hard regardless. Most influencers promote cheaper items, and a chair requiring assembly is far from an impulse purchase.

Why going out of stock for two weeks resets your rankings

Liz uses a repricer primarily to slow velocity rather than to chase sales.

That sounds backward until you consider the constraint. Selling 30 a day instead of 3 a day breaks a supply chain built around 380 units per container and a 90 to 120 day cycle.

When sales run too hot, she raises price or pulls back PPC to keep velocity inside what the supply chain can sustain.

The stockout math is why. From her own testing, being out of stock more than roughly 14 days means rebuilding rankings from scratch with substantial PPC spend. Under 14 days has little lasting impact.

What Amazon’s IPI score means for oversized sellers

The Inventory Performance Index is Amazon’s measure of how efficiently you turn inventory over.

Its origin is Amazon’s storage problem. Sellers put anything in the warehouses at any size for any duration, roughly 10% of it sold, and the remainder consumed space.

The consequence is a storage cap. Below 400 they limit your units and cubic feet, and above 400 that limit is released.

For oversized products the cap bites hard. Liz has had to pull several hundred units out into a third-party storage unit, so they can be sent back into FBA quickly rather than waiting on a fresh shipment from China.

Amazon publishes part of the formula and not all of it. Liz has tried to recreate it mathematically and cannot match their numbers, so the exact optimal units-per-day rate remains unsolved.

How to cut unprofitable products from your catalog

Two years ago Liz sold a wide assortment, like most Amazon sellers. Through 2018 and 2019 she cut the catalog down to what actually produced margin.

Her criteria covered products that were not converting, products converting at a loss, and products that were performing acceptably while consuming disproportionate staff time.

Removing those freed the team to improve the products that were working.

Exit strategy depended on Amazon’s long-term storage fees. Some products got price-slashed, and some she paid Amazon to destroy outright, since she has no fulfillment network of her own and destruction was cheaper than removal.

Why Liz uses Flexport over cheaper freight forwarders

Sleekform runs on Flexport, and Liz has priced alternatives including DHL, which quotes better rates.

The cheaper rate loses on total cost. Working with DHL would require enough additional labor that she would need to hire someone, and that hire costs more than the freight savings.

Flexport’s dashboard is what she is actually paying for, letting her understand at a glance where every shipment is without staff overhead.

Her comparison point is friends running more shipments through DHL who employ two or three people just moving product from point A to point B. Liz runs the entire business with three people including herself.

Frequently asked questions

What margin do you need to sell oversized products on Amazon?

Liz Mercer targets 18% gross margin after Amazon fees and PPC on furniture priced under $150. Precise supply chain management is what makes that margin survivable.

How do you maximize units in a shipping container?

Floor load instead of palletizing, and calculate exactly how many inches of clearance each side actually needs rather than accepting your supplier’s estimate. Palletize after arrival if required.

How long are lead times for furniture from China?

About 60 days for production on average, ranging from 45 to 75 days by factory, plus roughly 30 days for ocean freight and customs clearance to Amazon.

What is an Amazon IPI score?

The Inventory Performance Index measures how efficiently you turn inventory over. Below 400, Amazon caps the units and cubic feet you can store, which is especially restrictive for oversized products.

How long can you be out of stock on Amazon?

Roughly 14 days. Liz Mercer’s testing shows that coming back within two weeks has little lasting impact, while longer stockouts mean rebuilding rankings with heavy PPC spend.

How do you launch an expensive product on Amazon without discounting?

Parent-child the new item under an existing listing to inherit its demand, then go aggressive on sponsored ads while keeping price competitive rather than slashed.

Does box size affect Amazon FBA fees?

Significantly. An unnecessarily large box can move a product into a higher oversized tier, so verify dimensions with your manufacturer rather than accepting whatever box they have available.

Should you use a cheaper freight forwarder?

Only if you can absorb the extra work. Liz stays with Flexport despite better DHL rates because the staff time required to manage DHL would cost more than the freight savings.