STAC - Steel Cups

STAC - The Perfect Stackable Cup

Over the past three years, OREA has tried to make many cups suitable for milk-based drinks; some even reached the production prototype stage, only to be rejected at the very last moment. Why? Because that is the nature of product development—sometimes you love an idea until you actually hold it in your handStackable cups often look... "stackable." A bit ugly, rigid, and full of right angles, and even when they aren't, they usually don't stack very stably. We have too much OCD for this—we wanted something that feels natural but stacks with mechanical precision, something that fits perfectly. Three years later, they are finally here—and we are extremely happy with the result.

2 per Box

Because this is a "stacking" cup, we believe selling them in sets of two is the most appropriate. Currently, this product is not sold as an individual cup.

Natural Shape, Mechanical Fit

You won't find any right angles or sharp transitions on this cup, but you also absolutely won't find any wobbling, shifting, or rattling. OREA's partner factory spent a long time ensuring they achieved this design perfectly for OREA—which seems simple (it's just a metal cup), but it isn't. In fact, this cup was once considered for a name change because the "final" version at the time had a tiny bit of wobble. Fortunately, the engineers tried again, adjusted the molds, and, without being asked, created a new, improved version that stacks perfectly according to OREA's design. The world's best stackable cup doesn't even look like it can be stacked—we are incredibly proud of this.

Made of Stainless Steel

We used two grades of stainless steel for this cup. The inner layer is 316SUS, the highest quality stainless steel on the market—often used in the medical industry. The outer layer is 304SUS, which is already a grade used for high-end food products or thermoses. We upgraded the inner material because it is more resistant to acid and corrosion and produces absolutely no "metallic" taste. Since these cups are intended for milk and coffee, we believe this is the best choice. The interior is electropolished to reduce surface roughness, creating a chemically pure, microscopically featureless surface that significantly resists bacterial attachment and friction.

Double-Walled Design

This cup features a double-walled construction (like the beloved STEEL O1 brewer) to keep your drink hot while leaving the exterior cool to the touch. This cup has a larger air gap than the STEEL O1 brewer, ensuring better heat retention and a cooler exterior. Compared to similar ceramic cups, this cup keeps drinks warm for an incredibly long time.

Designed for the London Flat White

OREA's first milk-based drink cup pays tribute to the coffee beverage with the highest consumption in London—adopting the local preferred size: 5oz / 150ml. While this might be considered small in some countries, it is often the standard size for Flat Whites in the UK, Australia, New Zealand, and many specialty coffee shops across Europe. Many cafes make them with a single shot or a double ristretto.

Designed for Pouring

The interior of the cup is egg-shaped, neither too wide nor too high. We think this strikes a great balance: reducing the "bowl" feel while still making it easy to pour liquid in. The external shape is designed to fit easily in your palm while you pour. The same shape also provides a comfortable "handle" for holding it while drinking.

Flat White (+)

To be honest, these cups are suitable for many types of drinks. They are perfect for a Cortado or a simple espresso (hot or iced). They are also a great alternative for pour-over coffee and small matcha drinks. This is a versatile cup that saves space in your cupboard; stacking 4 STAC cups takes up the same space as one traditional mug. These cups are also perfect for micro-cuppings, using 7-8 grams of coffee, which reduces waste for small cupping sessions or for rare, expensive coffee.

Commercial Ready

Dishwasher safe, drop-resistant, and they will develop a lovely patina with use. These cups are perfect for commercial service, and their lifespan in a daily cafe environment can easily exceed that of ceramic, glass, or plastic. Stack them on your espresso machine and use them forever.

Supply Chain Choices

OREA produces the STAC with a family-run metalware manufacturer in China. We have visited them three times, witnessing every process step and how all the work is conducted. We work directly with the owner, who takes our feedback to heart. They treat their products with special care and respect—of course, they aren't the cheapest. But we really wanted to work with the best. From the raw materials they source to their openness to us visiting and filming everything, it has been a joy to work with them from day one. We know the price we offer you—or the price they offer us—will never be the lowest. If you are looking for low prices, you can buy from other companies. We focus on quality and value chain feedback—supporting those who do business the right way.

Product Specifications