Product Overview
The THERMOS Stainless King 16 Ounce Vacuum-Insulated Travel Tumbler is designed for maximum temperature retention, keeping beverages hot for up to 7 hours and cold for up to 18 hours. Constructed from high-quality 18/8 stainless steel, this tumbler is durable and features a leak-proof DRINKLOCK sealing lid. It is designed to be sweat-proof with cold beverages and cool to the touch with hot beverages. A built-in tea hook is included for convenience.

Image: The THERMOS Stainless King 16 Ounce Travel Tumbler in Matte Steel, shown with its lid.
Setup and First Use
- Unpack: Carefully remove the tumbler and all components from its packaging.
- Initial Cleaning: Before first use, wash all parts (tumbler body and lid) with warm water and mild dish soap. Rinse thoroughly. The tumbler and lid are top-rack dishwasher safe.
- Assembly: Ensure the lid components are correctly assembled after cleaning. The lid is designed for easy disassembly for thorough cleaning.

Image: Exploded view of the tumbler lid, showing its various components for cleaning and reassembly.
Operating Instructions
- Filling: Fill the tumbler with your desired hot or cold beverage. Do not overfill; leave space for the lid.
- Pre-heating/Pre-cooling (Optional): For optimal temperature retention, pre-heat with hot water or pre-cool with cold water for 5-10 minutes before adding your beverage.
- Sealing the Lid: Place the lid onto the tumbler and twist clockwise until securely tightened. Ensure the DRINKLOCK sealing mechanism is in the "closed" position to prevent leaks.
- Using the Tea Hook: If using tea bags or loose leaf infusers, utilize the built-in tea hook on the underside of the lid to secure them.
- Drinking: To drink, rotate the DRINKLOCK lever to the "open" position. After drinking, rotate it back to "closed" to maintain temperature and prevent spills.

Image: Detailed view of the tumbler lid, highlighting the built-in tea hook and indicating BPA-free 18/8 stainless steel construction.

Image: A hand holding the tumbler, emphasizing its leak-proof lid when properly closed.
Maintenance and Cleaning
- Dishwasher Safe: The THERMOS Stainless King Tumbler and its lid are top-rack dishwasher safe.
- Hand Washing: For best results and to prolong the life of your tumbler, hand washing with warm, soapy water is recommended.
- Lid Disassembly: The lid is designed to disassemble easily for thorough cleaning. Twist the plastic nut inside the mug a quarter turn to separate the open/close parts and the seal. Clean all components individually.
- Drying: Allow all parts to dry completely before reassembling and storing to prevent odor or mildew.
- Avoid Harsh Cleaners: Do not use abrasive cleaners, bleach, or chlorine-based products, as these can damage the finish and insulation properties.

Image: Visual guide demonstrating how the lid disassembles for comprehensive cleaning, confirming it is top-rack dishwasher safe.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Liquid leaks from lid | Lid not securely tightened or DRINKLOCK lever not in "closed" position. Gasket or seal improperly seated or damaged. | Ensure lid is twisted tightly onto the tumbler. Verify DRINKLOCK lever is fully in the "closed" position. Disassemble the lid, check that all gaskets and seals are correctly in place and free from debris, then reassemble. If damage is present, consider replacing the lid. |
| Beverage does not stay hot/cold | Lid not sealed properly. Tumbler not pre-heated/pre-cooled. Extreme ambient temperatures. | Confirm the lid is tightly sealed and the DRINKLOCK lever is closed. Pre-heat with hot water or pre-cool with cold water for 5-10 minutes before filling. Avoid leaving the tumbler in extreme hot or cold environments for extended periods. |
| Difficulty opening/closing lid | Lid overtightened. Debris in threads. | Avoid overtightening the lid; a snug fit is sufficient for a leak-proof seal. Clean threads on both the tumbler and lid to remove any residue. |
Specifications
- Model: SK1005
- Capacity: 16 Ounces (470ml)
- Material: 18/8 Stainless Steel (BPA-free)
- Insulation: THERMOS Vacuum Insulation Technology
- Temperature Retention:
- Hot: Up to 7 hours
- Cold: Up to 18 hours
- Lid Type: DRINKLOCK Sealing Lid (Leak-proof when closed)
- Special Features: Built-in tea hook, Sweat-proof exterior, Cool-to-touch with hot liquids, Cup holder compatible.
- Care Instructions: Top-rack dishwasher safe.
- Dimensions: Approximately 3.3" W x 7.8" H
- Item Weight: 4.8 ounces

Image: The tumbler with its dimensions (3.25 inches width, 7.8 inches height) and key features like DrinkLock sealing lid, vacuum insulation (7 hours hot, 18 hours cold), and dishwasher safe.

Image: The tumbler placed in a car cup holder, demonstrating its compatibility with most standard cup holders.
Warranty and Support
THERMOS products are manufactured with quality materials and workmanship. For specific warranty details or customer support, please refer to the official THERMOS website or contact their customer service department directly. Keep your purchase receipt as proof of purchase.
Official THERMOS Website: www.thermos.com