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Titanium coated handle
The handle sits flush and recessed in the lid, giving a natural feel when drinking. Its recesses let you unlock and quick release the shaft from the piston — and reattach it — without interrupting the brew-stop mechanism. Significant thought has gone into the form factor, keeping the mating parts sleekly integrated.
Brass shaft
One quick twist locks or releases the shaft. Brass has been selected for its natural antibacterial properties as well as its warmth and beauty — and its natural lubricating properties make connecting and disconnecting the piston easy. The engineering behind that twist is a triple start thread: 1 revolution connects or disconnects where a typical thread would require approximately 4 revolutions, and it strongly resists cross threading. Finally, the higher pitch keeps the breaking force very low, so the seal friction against the glass is balanced with the force required to break the thread. All planned and all precise – no accident
Piston Plunger
This is what keeps grinds and sediment out of your cup. Sized for exact sealing against the wall of the glass, the tolerances on this component were critical to get right — its simplicity was the real achievement. Made from a toughened alloy steel with titanium PVD coating for durability and stability, with umbrella valves selected to control the flow and make cleaning easy. Minimal moving parts, self cleaning, temperature resistance, hygienic and FDA approved materials mean submerging it in boiling water presents zero risk of plastic leaching or any other nasties. Your health and convenience were the real priority.
Piston Stabilizer
This component stops the piston rotating and breaking the seal — critical when you release the shaft and drink from the cup without the lid. Made from alloy steel coated in titanium PVD, it connects the same way as the shaft, sharing a common thread. Easy to connect and disconnect, impossible to cross thread. Convenient and functional.
Stainless steel laser cut filter
The filter is what keeps fines and floaties out of your cup, so every sip is clean. Made from surgical grade stainless steel 316, laser etched for perfect apertures with no flashing. Extensive testing identified the optimal aperture size and plate thickness, and extensive prototyping and research went into particle size distribution through the filter across a range of grind sizes. This was an interesting and surprising part of the product development — the filter plays such a significant role in the flavour profile.
Umbrella valve set
These valves keep over brewed liquid on the ‘dirty’ side of the piston where it belongs — designed so the breaking pressure at static and certain dynamic loading conditions doesn’t allow it to escape.
The umbrella valve has been optimised for the viscosities seen in tea and coffee, with principles from fluid dynamics shaping the thickness and hardness of the valves as well as how liquid flows through.
They are designed to be removed easily, multiple times, without damage if a deep clean is required — no need to buy new valves. And if you do damage or lose any, you can repair rather than replace.
Piston and Lid Seal
These seals are interchangeable, so in the worst case, if the piston seal breaks you can use the lid seal while you wait for your replacement. Made from an FDA approved silicone, these seals don’t release microplastics and are mould resistant.
If you have a Yeti, you can also borrow your Yeti seal and it will work temporarily — or if you lose your Yeti cup seal, our seals will fit the 70mm lids. You don’t need to buy a full lid from Yeti anymore.
360 degree anti-spill drinking seal
Made from the same food grade FDA approved mould resistant silicone, the anti-spill seal is easy to replace.
Shaft Seal
Made from the same food grade FDA approved mould resistant silicone, the shaft seal snaps in and out with ease.
Tritan Base lid
The base lid looks simple, but its inclined track and snap fit indents work together to give tactile feedback that was not easy to achieve — you can feel it click home. Minimal parts means cleaning is easy and there are no crevices for grime to accumulate.
Made from dishwasher safe Tritan by Eastman, this plastic is the gold standard and ‘go to’ for all the major brands like Stanley and Yeti. It’s proven safe. This is where plastics shine… complex design, dimensional stability, sealing, and thermal insulation are just a few advantages that improve your experience and the utility of the entire cup
Tritan Top lid
The top lid mates with the base and the handle, makes the 360 degree drinking and sealing possible, and controls the flow so your drink doesn’t come out too fast or too slow. There were so many configurations of this part to tune and make sure it worked in with the base, handle and shaft.
Made again from dishwasher safe Tritan by Eastman, this plastic is the gold standard and ‘go to’ for all the major brands like Stanley and Yeti. It’s proven safe
Tritan Lid Assembly
Together, the base and top lid deliver your drink to your mouth with comfort and familiarity. It was essential that the product felt right on your lips — no sharp edges, no lining up little mouth holes, no slurping or residual left over. Even the height and profile of the edge has been designed with 0.2mm precision.
The height of the profile fits the ergonomics of most faces, and we tested it on a lot of faces…
The edge is engineered so the last drop breaks clean off instead of dripping down the body of the cup — fluid dynamics were modelled to make sure of it. Again not by accident but serving you with convenience.
Piston plunger assembly
The real hero of the product, the core of the design and the real innovation. With the 2 opposing valves you can control when you want your brew to stop — and in the case of tea, you can even change the flavour profile if you want it stronger.
Borosilicate drinking Glass
Made from lead free virgin materials, the glasses are hand blown with precision by artisans. Borosilicate is the same glass used in lab equipment but we have increased the thickness to improve toughness. With dimensions critical to function we have added a level of quality control and a process of manufacturing new to the industry.
The glass volume has been calculated based on a medium 12oz coffee or tea. Sized for a 18-20g coffee shot (which is the industry standard). The dimensions of the piston and shaft have been precisely designed to minimise the amount of brewed liquid trapped on the dirty side of the piston, achieve 12oz of brewed gold but still allow the handle to mate keeping it flush with the lid when drinking.
The diameter of the cup is familiar and very close to that of a beer or soda can — which means the GROUNDD cup will fit in virtually every vehicle cup holder.
Walnut Hand Protector
The hand protector connects you to nature through the warm touch of natural timber. Sustainably sourced, each hand protector is unique in colour and grain pattern, no 2 products are the same. This reinforces our connection with the earth and we thought it was a nice way to connect with the cup both literally and metaphorically.

To keep your GROUNDD xpress pristine we recommend handwashing with soap and water. The borosilicate glass, Tritan lid and stainless steel filter are dishwasher safe. Keep the plunger & skirt and the walnut sleeve out of the dishwasher — dishwasher detergents are harsh and can discolour metals, especially brass.

The timber scald protector is a natural material and may loosen over time, especially when exposed to moisture. Keep dry and replace if it risks falling off.

Ensure all parts dry completely before storage. Humid conditions can promote mould or bacteria growth.

We recommend dismantling all seals occasionally and washing them to remove any buildup.

How much is shipping?
Free on orders over $65 within Australia, or $130 internationally. Below that it's $18 (Australia) or $25 (international, including any duty payable).

Can I return it?
Yes — you have 30 days. Email hello@groundd.com.au and we'll send you return instructions.

What does the Forever Guarantee cover?
Your GROUNDD xpress is designed to be repaired, not replaced. Manufacturing defects are covered with component replacement for up to 5 years — and replacement parts will always be available.

Is it dishwasher safe?
The borosilicate glass, Tritan lid and stainless steel filter are all dishwasher safe. Hand-wash the plunger, skirt and walnut sleeve.

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