If you're a Fressko fan, you already know about the internal fill line - one of our favourite little design details that takes the guesswork out of your order. It's there so your barista knows exactly where to pour to, giving you the perfect ratio every time. No watered-down lattes. No disappointment.
But here's the thing about real life: it moves fast. Cafe mornings are busy, muscle memory is powerful, and filling a cup to the brim is second nature for most baristas. Lids usually just sit on top, right? So you can hardly blame them.
You know the moment. You watch the coffee get poured just a little too high. You hand over your Fressko. You cringe as the lid goes on and coffee begins to creep out the sides, or you find yourself frantically sipping a too-hot latte in the middle of a cafe just to get the level back under the line. We've all been there.
Exhibit A ⬇
Here's what's actually happening
When your cup is overfilled, and the lid is placed on top, the vacuum seal creates pressure inside the cup. That pressure has to go somewhere, and unfortunately, it goes sideways. Out of the lid. Down the side of your beautiful cup. Onto your hand, your bag, your day. It's not a flaw. It's physics. But there's a simple fix.
The overfill hack
Next time your coffee goes over the fill line, try following the steps below before putting the lid on:
Open the spout first. This is the key step. An open lid lets air escape from the top as you seal the cup, which means the pressure has somewhere to go that isn't your sleeve.
Keep the spout OPEN. Whilst placing the lid on your Fressko reusable cup.
Once on, twist the lid to secure, just as you normally would, except with the spout open
Close the spout. That's IT. No spill. No scramble. No sad, coffee-soaked tote bag.
Why it works
By leaving the flip lid open during sealing, you're releasing the pressure before it builds. The vacuum seal forms around air that can escape freely from the top, rather than forcing liquid out the sides. Simple, satisfying, and genuinely useful to know.
A small detail that makes a big difference
Have you experienced the dreaded overfill spill? Let us know if this hack works for you.