Portable carbonation system

SLIMDESIGN worked with ROAM from the first product idea to a complete portable carbonation system. The project included research, concept development, industrial design, mechanical engineering, prototyping, CMF, bottle design, lid architecture, packaging, and production support.

At the centre of the system is ROAM SodaTop, a compact carbonator that turns still water into sparkling water directly inside the bottle. Around it, we developed the supporting product family: the Ultimate Carbonation Bottle, the TravelTop drinking lid, the CO₂ cartridge system, and the packaging experience.

Challenge

Sparkling water usually depends on either single-use bottles and cans or a countertop machine with a large CO₂ cylinder. ROAM wanted to move carbonation into a portable bottle format without losing pressure safety, usability, or everyday durability. The task was to turn an early product idea into a complete system that could be used at home, at work, and on the move.

Approach

We started by researching the user journey, the carbonation process, and the mechanical constraints behind a compact pressure system. From there, we developed concepts to validate the architecture before committing to the final industrial design. The work covered the SodaTop mechanism, the bottle, the TravelTop lid, prototypes, CMF, packaging, and production support.

 

Result

The result is a launch-ready portable carbonation system built around ROAM SodaTop. The product family combines a compact carbonator, an insulated stainless steel bottle, a pressure-aware drinking lid, recyclable CO₂ cartridges, and a coherent packaging system. ROAM has since introduced SodaTop publicly through Kickstarter, CES press coverage, and international design awards.

 

Moving carbonation from the counter to the bottle

The core design move was to remove the carbonation appliance from the kitchen counter and integrate the function into a portable bottle system. Instead of asking the user to bring water to a machine, SodaTop brings the carbonation mechanism to the bottle.

That shift changed the full product architecture. The carbonator had to be compact enough to carry, robust enough for repeated use, and simple enough to operate without making the product feel technical. Every part of the system had to support that change: the cap, bottle, cartridge, seal, pressure release, drinking interface, and packaging.

Designing around pressure

Carbonation turns a simple bottle into a pressure system. That made the lid architecture one of the most important parts of the project. The product had to carbonate the water, keep the bottle sealed, release pressure safely, and allow the user to drink without unexpected pop-off or leakage.

The TravelTop was developed as the daily drinking interface for the system. It had to feel familiar as a bottle lid, while still dealing with the specific behaviour of carbonated water. This required careful work around pressure release, sealing, opening force, drinking flow, and cleaning.

The Full System

ROAM is not a single cap. It is a product system built around portable carbonation. Each part has a specific role: SodaTop carbonates, the bottle holds pressure and temperature, and TravelTop turns the pressurised bottle back into a normal drinking experience.

The system was developed as one product family. That meant the interfaces, proportions, colours, materials, sealing surfaces, and user interactions had to work together from the start.

SodaTop

SodaTop is the compact carbonation unit that screws directly onto the ROAM bottle. It uses a small CO₂ cartridge to carbonate one bottle of tap water. The design work focused on reducing the carbonator to a portable format while keeping the mechanism clear, robust, and easy to operate.

TravelTop

TravelTop turns the bottle back into a normal drinking object after carbonation. Its architecture is built around controlled pressure release, sealing, and drinking flow. The goal was to make the pressure behaviour safe and understandable without making the lid feel technical in daily use.

Bottle

The bottle is part of the pressure system, not just a container. It is designed to hold carbonated water, preserve temperature, and connect securely to both SodaTop and TravelTop. The wide mouth, insulated stainless steel construction, and polished interior support filling, cleaning, ice use, and carbonation retention.

Prototyping & Production Support

SLIMDESIGN supported ROAM from the first product idea through production preparation. The work included research, sketches, concept models, CAD, mechanical layouts, functional prototypes, CMF, bottle design, lid architecture, supplier communication, and production support.

Prototypes were used to validate the physical behaviour of the system before finalising the design. The key questions were mechanical: how the cartridge loads, how the cap seals, how the bottle holds pressure, how the pressure is released, how the lid opens, how the parts are cleaned, and how the product is assembled.

This development process allowed the product to move from idea to launch-ready hardware without separating design from engineering.

Launch, press and recognition

ROAM introduced SodaTop publicly through Kickstarter and CES 2025. The product has since received press coverage and international design recognition in product design, eco design, and kitchen accessory categories.

For SLIMDESIGN, the recognition supports the main result: ROAM moved from an early idea to a complete consumer hardware system with a defined architecture, tested prototypes, coherent CMF, and production support.

Real world impressions

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