S'well Onyx Mug with Handle, 350 ml Stainless Steel Travel Mug

Fit and sizing

At 350 ml, this stainless steel mug is sized for a morning coffee or breakfast tea, with a handle that makes it comfortable to hold at home, at work or while travelling. Its dimensions are 8.8W x 10.8H centimetres, so you can judge the space it will take up alongside your usual travel essentials. The Black Onyx finish has a stone-like texture designed to add grip, bringing a practical detail to its understated look.

A slide-open, splash-proof lid helps protect your drink from spillages as you move around. The vacuum-insulated construction keeps drinks hotter or colder for longer, while the condensation-free exterior stays dry in your hand or bag. It offers a useful alternative to an open cup when you want a more contained drink for a commute or a desk-side break.

Pros

The combination of a handle and a travel-ready lid makes this mug easy to use throughout the day: carry it between rooms, take it to work or keep it close during breakfast. Its 350 ml capacity suits a regular coffee or tea serving, and the reusable stainless steel construction is BPA/BPS-free. The vacuum insulation is useful for both hot and cold drinks, so the mug can move from a morning coffee to a chilled drink without changing its role.

The Black Onyx colour and textured finish give it a distinct look without sacrificing everyday practicality. When choosing between a travel mug and a simple open cup, the lid and insulation here are the key differences: they help contain splashes and maintain drink temperature for longer. The mug is also dishwasher safe, making routine cleaning more straightforward.

Specifications

• Capacity: 350 ml
• Material: Stainless steel
• Colour: Black Onyx
• Dimensions: 8.8W x 10.8H centimetres
• Weight: 226 grams
• What’s included: Handle and lid

Before you decide

How much does the S'well Onyx mug hold? It has a 350 ml capacity, suitable for a morning coffee, breakfast tea or another everyday drink.

Does it help keep drinks hot or cold? Yes. Its vacuum-insulated construction is designed to keep beverages hotter or colder for longer, without a stated time duration.

How should I clean it? The mug is dishwasher safe, so it can be cleaned in the dishwasher as part of your regular kitchen routine.

Buying verdict

For a reusable travel mug with a handle, the S'well Onyx combines a practical 350 ml size with vacuum insulation and a splash-proof lid. It is well suited to people who want their coffee or tea close at hand at home, at work or while travelling, with a textured Black Onyx finish and dishwasher-safe care to support everyday use.