S'well Onyx 530ml Tumbler with Lid, Triple-Insulated Stainless Steel

Triple-layer vacuum insulation is designed to keep drinks cold for up to 12 hours or hot for up to 4, making this S'well tumbler useful when you want to take a drink from home to work or out for the day.

Its transparent sliding lid opens for sipping, while the wide mouth makes it easier to add ice. The black Onyx finish gives it a simple look that suits everyday use.

Need a cup that travels in a bag without any chance of spills? The lid is designed to help contain drinks, but the product guidance says to keep the tumbler upright and avoid overfilling.

Usage tips

Use it for hot or cold drinks at a desk, in a meeting or on a picnic. The opening can accommodate ice cubes, so it also suits chilled drinks that you want to keep cold for longer. The stated insulation times are up to 12 hours for cold drinks and up to 4 hours for hot ones, these are useful reference points, rather than a reason to expect every drink to stay at exactly the same temperature in every setting.

Keep the tumbler upright and do not fill it right to the top. The body is hand-wash only, while the transparent lid is dishwasher safe. That difference matters if you want a cup that can go straight into the dishwasher as a complete item: this one needs separate care for its main body and lid.

Specifications

• Type: Tumbler with lid
• Capacity: 530 ml
• Material: 18/8 stainless steel
• Colour: Black, Onyx design
• Insulation: Triple-layer vacuum construction
• Temperature retention: Up to 12 hours cold and 4 hours hot
• Lid: Transparent sliding lid
• Care: Hand-wash tumbler, dishwasher-safe lid
• Other details: BPA/BPS-free, designed to reduce condensation on the exterior

Where it shines

The main appeal is the combination of reusable stainless steel construction and insulation for both hot and cold drinks. It makes sense if you want one cup for a morning coffee and later a cold drink, rather than choosing a single-purpose cup. The wide mouth is another practical detail for adding ice or refilling, while the slim rim is intended to make sipping straightforward.

Buyer feedback is positive about the appearance and design, and some also praise how long drinks stay hot or cold. The lid receives more mixed reactions: some customers find it helps prevent spills, while others report leakage. That makes the upright-use guidance worth taking seriously, especially when carrying it alongside valuables.

You’ll like it if you want an insulated, reusable tumbler for drinks on the go and are happy to wash the body by hand. Not the best choice if you need a cup that can be treated as fully leakproof in a bag or want every part to be dishwasher safe.

Practical questions

Can it hold hot and cold drinks? Yes. It is intended for both, with stated retention of up to 4 hours hot and up to 12 hours cold.

Can the tumbler go in the dishwasher? The lid is dishwasher safe, but the stainless steel body is hand-wash only.

Is the lid suitable for carrying it on its side? The product guidance recommends keeping the tumbler upright and avoiding overfilling. Customer feedback on leakage is mixed, so it is better not to rely on the lid as a guarantee against spills when laid down.

Should you buy it?

Choose the S'well Onyx if you want a 530 ml stainless steel tumbler with a sliding lid and insulation for both hot and cold drinks. Its everyday case is strongest for upright use at a desk, on a commute or during an outing, where the temperature retention and reusable format are useful. If dependable sideways transport or a fully dishwasher-safe cup is essential, a different lid design or a simpler all-dishwasher-safe option may suit you better.