You walk into Costco expecting to grab your go-to cereal, your preferred laundry detergent, or that specific brand of sparkling water you’ve been buying for years. It’s not there. It’s never there. And the thing sitting in its place? A giant bag or box stamped with “Kirkland Signature” that you didn’t ask for.
This isn’t an accident. Costco isn’t failing to get your favorite brands on the shelf. It’s choosing not to. And the reasons behind that choice explain basically everything about how Costco works — and why its 93% membership renewal rate makes every other retailer jealous.
Costco Carries a Fraction of What Normal Grocery Stores Sell
Here’s a number that might surprise you: a typical Costco warehouse carries about 4,000 SKUs. That’s the industry term for unique product codes — every size, flavor, and variant gets its own. A regular supermarket? Around 30,000 SKUs. Amazon has over 100,000. So Costco is operating with roughly 13% of what a normal grocery store offers, inside a building that’s 150,000 square feet.
That extreme curation is the entire point. By limiting what they sell, Costco can buy massive quantities of fewer products. That gives them enormous negotiating power with suppliers. When you’re the world’s third-largest retailer and you’re telling a brand “we’ll take a hundred million units of this one thing,” you get a price that smaller buyers can only dream about.
Fewer products also means simpler logistics — less warehouse complexity, faster inventory turnover, less wasted shelf space on stuff that doesn’t move. Costco’s inventory turns over about 11.6 times per year, which absolutely crushes most competitors. That speed is what keeps everything fresh and cheap.
If a Brand Won’t Play Ball on Price, It Gets Cut
Costco has a hard rule that most shoppers don’t know about: markups are capped at 14% on branded items and 15% on Kirkland Signature products. That’s it. Compare that to traditional retailers who routinely mark things up 25% to 50% or more.
This means that when a brand comes to Costco, they have to accept selling at lower profit margins than they’d get almost anywhere else. A 24-pack of San Pellegrino sparkling water runs between $18.94 and $24.69 at Costco. That same amount costs $27.98 to $35.76 at grocery stores. A Cuisinart Barista Bar coffee maker? $249.99 at Costco versus $379.95 on Cuisinart’s own website.
Some brands look at those margins and say no thanks. They’d rather protect their pricing structure and brand image than move a ton of units at a lower price point. Costco’s response to that is basically a shrug. They don’t chase anyone. They don’t beg. If a brand won’t sell to them at the right price, Costco just makes its own version.
Kirkland Signature Is Bigger Than Nike and Coca-Cola
This is the part that blows people’s minds. Kirkland Signature — the store brand you might mentally file under “generic” — pulled in $58 billion in sales during Costco’s latest fiscal year. That makes it the biggest consumer packaged goods brand in America by sales. Bigger than Hershey. Bigger than Campbell Soup. Bigger than Kellogg.
It accounts for about a quarter of everything Costco sells. And the margins on Kirkland products are nearly double what Costco earns from national brands — around 15% compared to roughly 8% on name-brand goods.
The Kirkland story started in 1995. Before that, Costco (then called PriceCostco) had about 30 different private-label brands with forgettable names like Simply Soda, Chelsea toilet paper, and Nutra Nuggets dog food. Co-founder Jim Sinegal saw that those scattered brands weren’t building any loyalty. So he killed them all and replaced every single one with Kirkland Signature, named after the Seattle suburb where the company had its headquarters. One brand. One name. One level of quality to maintain.
That was a gutsy call. Conventional retail wisdom says you should have multiple private labels — different names for different product categories — so that one bad product doesn’t tank your whole line. Walmart has more than a dozen private brands. Target has dozens. Amazon reportedly has over 400. Costco bet everything on one name, and it paid off spectacularly.
Name Brands Are Secretly Making Kirkland Products
Here’s where it gets really interesting. Many of those Kirkland Signature products sitting on the shelf right next to their name-brand competitors? They’re made by those same competitors. Kimberly-Clark, the company behind Huggies diapers, also produces Kirkland Signature diapers. Duracell makes Kirkland batteries. Georgia-Pacific, which owns Brawny and Dixie, produces store brands too. So does Henkel, the manufacturer behind Purex and Dial.
Costco keeps the identities of its manufacturers officially under wraps, but fans online are obsessive about figuring out who makes what. Kirkland wines come from established vintners. The vodka has been endlessly compared to Grey Goose (though that connection has never been confirmed). It’s an open secret that many “premium” brands are happy to run their production lines for Kirkland — they just don’t love advertising the fact.
The whole setup creates what Costco CFO Gary Millerchip described in a 2025 earnings call as a “healthy tension.” National brands know that if they raise prices too high or let quality slip, Costco will just have someone make a Kirkland version that’s 20% cheaper and arguably just as good. That keeps everyone honest.
Costco’s Buyers Are Basically Bargain Hunters With Corporate Cards
Costco’s buying team doesn’t just fill shelves — they actively search for spots where national brands are overcharging consumers. If a company that makes golf balls raises prices but manufacturing costs haven’t actually gone up, Costco’s buyers pounce. That’s how Kirkland golf balls came to exist — and they were so popular they kept selling out.
CEO Ron Vachris put it plainly during a recent earnings call: “We will never succumb to not being the best price and driving prices down for our members. That’s what Costco is known for.” The company has a stated goal that every Kirkland product must deliver at least 20% better value than whatever name brand it’s sitting next to. If they can’t hit that number, they won’t make the product.
This has actually led to some high-profile legal battles. Titleist sued Costco over patent infringement on those golf balls. Williams-Sonoma sued Amazon for a similar private-label issue. Costco settled, but the message was clear: they’re not afraid to step on toes.
Products Get Killed for Reasons You’d Never Expect
Costco’s willingness to drop products — even beloved ones — is borderline ruthless. They pulled cigarettes and tobacco from stores back in 2016, not because of a health crusade, but because tobacco had low margins, high theft rates, and required too much labor to comply with local regulations. They basically said “this space could make us more money selling something else” and that was that.
Studded car tires? Gone since 2007 because they damage roadways. Chaokoh coconut milk got dropped over reports of unethical labor practices. Palmetto cheese was yanked after its founder made controversial social media posts. Wild swordfish, bluefin tuna, and Atlantic cod are all off-limits unless they carry Marine Stewardship Council certification.
And then there’s Kirkland Signature light beer, which was discontinued in 2018 after reviews so devastating that one person compared its flavor to a urine-soaked diaper. Even Costco knew when to cut its losses on that one.
When Costco Can’t Win on Price, It’ll Swap to a Name Brand
This one surprised me. In August 2024, Costco announced it was discontinuing both of its Kirkland Signature chocolate chip products. The reason? Cocoa prices had shot up more than 200% compared to 2023 due to climate-related production drops and El Niño disruptions. Costco couldn’t maintain the Kirkland price point, so rather than sell an overpriced version of its own brand, it replaced them with Nestlé brand chocolate chips instead.
That decision tells you everything about how Costco thinks. The Kirkland name means something specific — quality at 20% less than the alternative. If they can’t deliver on that promise, they’d rather sell someone else’s product than damage the brand. It’s the same reason they refunded every single customer who bought the Kirkland Signature Performance One golf balls when they didn’t meet quality standards. Full refund, with a note saying the balls fell short of expectations.
Decision Fatigue Is Part of the Strategy
There’s actual science behind the limited selection. Research shows that too many options cause decision fatigue — that paralyzed feeling you get staring at 47 different pasta sauces in a grocery store. You end up buying nothing, or grabbing whatever’s closest just to escape the aisle.
Costco gives you maybe two or three choices per product category. There’s the name brand, there’s Kirkland, and maybe one other option. You compare, you decide, you move on. That simplicity is actually freeing. You spend less mental energy on mundane choices and you get through the store faster — though “fast” is a relative term when you’re pushing a flatbed cart past a tower of 96-roll toilet paper packs.
The limited selection also feeds what Costco calls the “treasure hunt” experience. Because inventory rotates and brands come and go, you never quite know what you’ll find on any given visit. You might stumble across Burberry coats at one location and Columbia jackets at another. That unpredictability keeps people coming back and spending more than they planned — which, if you’ve ever walked out of Costco with a kayak you didn’t know you needed, you already understand perfectly well.
So the next time your favorite brand is missing from Costco’s shelves, know that it’s not an oversight. It’s the whole system working exactly the way it’s supposed to. Costco isn’t building a store where you can find everything. It’s building a store where everything you find is worth buying.
