You ever turn over a mug and say to yourself—okay wait, what the hell is that? Like, there’s this little chunk missing from the bottom, and it doesn’t look accidental exactly, but it doesn’t look normal either. I have this plain white IKEA mug I use basically every day, and one morning I’m rinsing it out—like, half asleep—and I see that notch. It’s small, right in the bottom ring. Looks like a chip, but not a sharp one. Just… a little bite taken out of the base.
Naturally, I assumed I broke it. Thought maybe it hit the edge of the sink or knocked against another mug when I was rushing to unload the dishwasher. I even asked my husband if he dropped it, and he looked at me like I was accusing him of cheating. He hadn’t noticed anything either. I figured, alright, no big deal. Accidents happen.
But then I checked another one. Same notch. Exact same spot. Then another. And okay, that’s when it got weird. Either I had an incredibly specific mug-breaking technique I wasn’t aware of—or, more likely, this was intentional.
So I went down the rabbit hole. You know the one. The “why does my mug have a chip but not actually” search spiral. IKEA mug chip. Notch in bottom of mug. Ceramic mug defect that isn’t. You know the vibe.
And yeah. It’s not a chip. It’s on purpose.
It’s not damage. It’s drainage.
Turns out, the main reason that little notch exists is super practical—and kind of boring in the best way: drainage.
Like, think about what happens when you load your mugs upside down in the dishwasher. Or flip them onto a drying rack. That circular ring on the bottom? It turns into a moat. Water just pools there. It’s a stupid little puddle that clings to the base even after everything else is bone dry. So every time you go to put the mug away, you get that surprise splash of leftover water across your hand or shelf.
The notch—this tiny, subtle cutout—is there to stop that. It lets water escape. Just a little exit path, like a side door for drops that would otherwise hang around forever. That’s it. That’s the big reveal.
Everything else it does? Nice bonuses, but this—this is the reason it’s there.
Once you know that, it makes so much sense you’ll wonder why every mug doesn’t have one.
It helps with stacking too, kind of
Okay, so this part’s still true—just not the headliner.
Because mugs aren’t flat on the bottom, they tend to nest kind of awkwardly when you try to stack them. And if the bottom ring is fully glazed and sits flush against the mug underneath, you get all kinds of annoying issues. Grinding. Sticking. That awful squeaky-scrape when you twist one loose. Sometimes the rim even chips from the pressure.
That little notch? It gives just enough wiggle room. Breaks the seal. Adds air flow. Makes the stack slightly offset so the glazed parts don’t press too hard against each other. No more mug Jenga gone wrong.
So yeah, the chip definitely helps with stacking. But again, drainage comes first.
Suction? Not a problem anymore
You ever set a mug down on a wet counter and then go to pick it up, and it’s like… stuck? Just for a second, like the table’s trying to claim it? That’s suction. Most mugs have that full ring base, so any water under there turns into a seal.
IKEA’s notch kills that problem too. It lets a tiny bit of air slide under the base so it never fully locks down. You go to pick it up and it just lifts—no tug, no little pop. Smooth. It’s one of those things you only notice once you’ve experienced the non-notched version, but after that, there’s no going back.
Still not the reason the notch exists. But definitely a bonus.
Also, yes, it helps during firing (if you care about that sort of thing)
Okay, now this part got nerdy fast, but I did fall into some pottery forums so you don’t have to. When ceramics get fired in a kiln, the clay expands under heat. Then it shrinks again when it cools. If a mug has a perfectly continuous ring on the base, that can trap stress. Stress turns into warping, cracking, or weird unevenness.
But a tiny break in that ring—like, say, a little drainage notch—helps relieve that tension. It gives the heat and pressure somewhere to go. Not all potters do this, but in mass manufacturing? It’s smart. IKEA’s probably getting fewer breakages, less waste, more consistency.
It’s not the purpose of the notch. But it is something the notch happens to help with.
IKEA being IKEA
This whole thing feels like peak IKEA. Like, their products always seem super basic, but then you realize they’ve quietly solved five problems with one tiny design decision. And they don’t even tell you. There’s no sticker that says “Innovative drainage-enhancing micro-notch technology.” It’s just there. You either notice it, or you dry your mug and keep wondering why it’s still wet underneath.
And of course, there are shipping benefits too. Mugs that stack better need less packaging. That means less cardboard, more mugs per box, fewer cracked ones in transit. And because they dry better, they don’t get moldy or musty during storage. Again, none of this is why the chip is there. But once it’s there for drainage, all the other perks just fall into place.
Design dominoes.
Some people still think their mug’s broken
Which—understandable. You flip over your cup and see a literal chip? Of course you think it’s damaged. And it kind of looks that way. It’s asymmetrical, doesn’t match the aesthetic, and feels like something went wrong at the factory.
But once you know? You stop seeing it as damage. You start seeing it as this small, smart fix.
It’s kind of charming, honestly. Like IKEA left a secret engineering signature under your $2 mug.
Now I can’t stop looking
I’ve started checking the bottoms of mugs everywhere. At cafés, friends’ kitchens, random gift shops. Most don’t have the notch. Some do. Only certain IKEA lines, apparently. But when I spot one, I get this weird little nod-to-self feeling like, “Ah. You get it.”
And yeah, I’ve started telling people. Usually unsolicited. Sorry. But hey—somebody has to spread the gospel of the drainage notch.
So no, it’s not broken. It’s just smarter than it looks.
Next time you flip your mug and see that weird little chip? Don’t freak out. You didn’t broke it, neither did your husband or any other family member you wanna blame for it. It’s not a defect and no, it’s not poor quality. It’s literally there to stop water from pooling, to help it dry, and to keep your shelf from getting damp and gross.
The stacking, the suction thing, the kiln benefit—all great. But it’s really just about letting the water out.
That’s it. One notch. No drama. No bragging. Just a quiet little improvement that works like it’s not even there.
Which honestly makes it kind of perfect.
