Introduction
Thank you for choosing the THERMOS Light and Compact Stainless Steel Flask. This manual provides essential information for the safe and effective use of your new flask. Please read it thoroughly before first use and retain it for future reference.
Product Overview
The THERMOS Light and Compact Flask is designed for superior temperature retention, keeping your beverages hot or cold for extended periods. Its durable stainless steel construction and compact design make it ideal for daily use and travel.
Key Features:
- Vacuum Insulation: Double-walled vacuum insulation for maximum temperature retention, keeping contents hot for up to 12 hours and cold for up to 24 hours.
- Durable Construction: Virtually unbreakable, dent-resistant stainless steel body.
- Compact Design: Lightweight and compact, allowing for larger capacity in a smaller form factor.
- Innovative Stopper: Push-button stopper for easy and precise pouring.
- Integrated Cup: The lid doubles as a serving cup for convenience.

Image: The THERMOS Light and Compact Stainless Steel Flask, highlighting its 500ml capacity and 18-hour hot / 24-hour cold retention.
Setup and First Use
- Unpack: Carefully remove the flask from its packaging.
- Initial Cleaning: Before first use, wash all parts (flask body, stopper, and cup) with warm water and mild dish soap. Rinse thoroughly. Do not use abrasive cleaners or scrubbers.
- Pre-heating/Pre-cooling (Optional): For best results, pre-heat the flask with hot water for 5-10 minutes before adding hot beverages, or pre-cool with cold water for 5-10 minutes before adding cold beverages. Empty the pre-heating/pre-cooling water before filling.
Operating Instructions
Filling the Flask:
- Unscrew the outer cup and then the inner stopper.
- Fill the flask with your desired beverage, leaving a small space at the top to allow for the stopper.
- Securely screw the inner stopper back onto the flask. Ensure it is tight to prevent leaks and maintain temperature.
- Screw the outer cup back on.
Pouring Beverages:
- Unscrew the outer cup to use as a serving cup.
- Press the push-button on the stopper to open the pouring spout.
- Pour the beverage into the serving cup.
- Press the push-button again to close the spout after pouring to maintain temperature.
- Replace the outer cup.

Image: Close-up of the flask's top, showing the push-button stopper and the outer lid that functions as a cup, illustrating pouring with precision.
Video Demonstration:
Video: A demonstration of the THERMOS flask, including how to open the lid, use the serving cup, and operate the push-button stopper for pouring.
Maintenance and Cleaning
- Hand Wash Only: This flask is not dishwasher safe. Hand wash all components with warm water and mild dish soap.
- Thorough Rinsing: Rinse all parts thoroughly after washing to remove any soap residue.
- Drying: Allow all parts to air dry completely before reassembling or storing to prevent odors and mildew.
- Deep Cleaning: For stubborn stains or odors, a mixture of baking soda and warm water can be used. Let it sit for a few hours before rinsing.
- Avoid Abrasives: Do not use bleach, chlorine-based cleaners, or abrasive scrubbers, as these can damage the finish and insulation properties.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Liquid not staying hot/cold | Stopper not sealed properly; no pre-heating/pre-cooling; damaged vacuum seal. | Ensure stopper is tightly closed. Pre-heat or pre-cool the flask before use. If the issue persists, the vacuum seal may be compromised. |
| Leaking | Stopper not tightened; stopper gasket is worn or missing. | Ensure the stopper is securely tightened. Check the stopper gasket for proper placement and condition. Replace if damaged. |
| Unpleasant odor | Incomplete cleaning; residue from previous beverages. | Clean thoroughly with warm water and mild soap. For persistent odors, use a baking soda and water solution. |
Specifications
| Attribute | Detail |
|---|---|
| Brand | THERMOS |
| Model Name | FBB500 |
| Item Model Number | 184093 |
| Capacity | 0.5 Liters (500 Milliliters) |
| Material | Stainless Steel |
| Color | Stainless Steel |
| Product Dimensions | 2.56"W x 9.45"H |
| Item Weight | 0.34 Kilograms (12 ounces) |
| Temperature Retention (Hot) | Up to 12 hours |
| Temperature Retention (Cold) | Up to 24 hours |
| Care Instructions | Hand Wash Only |
| Cap Type | Screw Cap with Push-Button Stopper |

Image: Visual representation of the flask's dimensions (7cm width, 26cm height) and weight (350g), shown next to a 330ml can for scale.
Warranty and Support
For warranty information or customer support, please refer to the official THERMOS website or contact their customer service directly. Keep your purchase receipt as proof of purchase.
Official THERMOS Store: Visit the THERMOS Store





