Onyx Mug

12oz
16oz
Size Chart

Keeps drinks hotter or colder, for longer.

BPA/BPS-free and reusable.

Vacuum-insulated, food-grade 18/8 stainless steel.

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Design-focused

The Stone Collection

Embodying translucent hues in the purest form, the Stone Collection emulates the most coveted semi-precious gems. Featured in a durable stone-like texture for added grip, the muted color palette simulates the raw delicacy of the minerals.

Thoughtfully Designed

  • S’well Mugs offer easy carrying and sipping with a splash-proof, Slide-Open Lid and handle that fits most cup holders.
  • Perfect for your morning cup of joe, tea, hot chocolate or iced coffee.
Form Factor-focused

Thoughtfully Designed

  • S’well Mugs offer easy carrying and sipping with a splash-proof, Slide-Open Lid and handle that fits most cup holders.
  • Perfect for your morning cup of joe, tea, hot chocolate or iced coffee.
Form Factor-focused

Looks Good, Performs Beautifully

  • S'well Tumblers and Mugs feature Therma-S'well® Technology with triple-layered, vacuum-insulated construction, designed to keep beverages colder or hotter, longer than all the rest.
  • Offers a condensation-free exterior that won't sweat in your hands or bag.
  • BPA/BPS-free and reusable.
  • Made from 18/8, food-grade stainless steel with superior construction to reduce the need for single-use cups.
  • Top-rack, dishwasher safe.
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Frequently Asked Questions
How does my S’well work?
S'well bottles, Travelers, and Roamers will keep your beverage cold for up to 24 hours or hot for up to 12. Thanks to our triple-walled ThermaS'well™ insulation technology, which includes a copper layer, S'well products are able to keep any liquid hot or cold for long stretches of time. See more.
Will my S’well product sweat?
No way! Thanks to S’well’s triple-walled insulation, which includes a copper layer, the outside of your S’well will stay completely condensation-free. See more.
Can I fly with my S'well?
Prepare for take off! Your S’well is airport security friendly, as long as you remember to empty out what’s inside first. See more.
Does S'well sell different caps & lids?
Designed to accommodate your active and on-the-go lifestyle, S’well has released a variety of accessories sold separately. See more.
What is the warranty on S’well products?
S’well offers a one-year limited warranty on all bottles purchased from swell.com and authorized retailers with proof of purchase. This warranty covers any manufacturer defects, such as thermal performance issues, base becoming detached from the bottle and non-polished surfaces. See more.
Still have questions? Go here.
Some S'well Feedback
12oz 12oz

Perfect for a cup and a half of your morning joe or tea.

Keep drinks hotter/colder for longer
3.46"D x 4.29"W x 4.25"H
0.50lbs
16oz 16oz

Perfect for two cups of your morning joe or tea.

Cold for 10 hours
Hot for 3 hours
3.46"D x 4.49"W x 5.35"H
0.62lbs