Introduction
Thank you for choosing the Tescoma Constant 1L Stainless Steel Vacuum Flask. This manual provides essential information for the safe and efficient use, care, and maintenance of your new flask. Please read these instructions carefully before first use and retain them for future reference.

Image: The Tescoma Constant 1L Stainless Steel Vacuum Flask, featuring a sleek, brushed stainless steel body and a black handle on the integrated cup/lid.
Setup
Unpacking
- Carefully remove the vacuum flask and all components from the packaging.
- Inspect the flask for any signs of damage. If damaged, do not use and contact customer support.
- Recycle packaging materials responsibly.
First Use Preparation
- Before first use, wash the flask, cup, and lid thoroughly with warm water and a mild detergent.
- Rinse all parts completely to remove any soap residue.
- Allow all components to air dry completely before assembly or storage.
Operating Instructions
Filling the Flask
- Unscrew the cup/lid from the top of the flask.
- Press the one-touch closure button to open the pouring mechanism.
- Pour your desired hot or cold beverage into the flask. Do not overfill; leave a small space at the top.
- Press the one-touch closure button again to seal the pouring mechanism.
- Screw the cup/lid back onto the flask securely to ensure a tight seal.
Using the Cup
- The top part of the flask serves as a convenient drinking cup. Simply unscrew it from the main body.
- Pour your beverage into the cup by pressing the one-touch closure button on the main flask.
- After use, rinse the cup and reattach it to the flask.
Maintaining Temperature
- For best results with hot beverages, pre-heat the flask by filling it with hot water for 5-10 minutes before adding your drink. Discard the hot water before filling.
- For best results with cold beverages, pre-chill the flask by filling it with cold water or ice for 5-10 minutes before adding your drink. Discard the cold water/ice before filling.
- Ensure the lid is always securely fastened to maintain temperature efficiency.
Care and Maintenance
Cleaning
- Hand Wash Only: This flask is not dishwasher safe. Washing in a dishwasher may damage the vacuum insulation and exterior finish.
- Wash the flask and all components with warm, soapy water after each use.
- Use a bottle brush for thorough cleaning of the interior.
- Rinse thoroughly with clean water and allow to air dry completely with the lid off to prevent odors.
- For stubborn stains or odors, a mixture of baking soda and warm water can be used. Let it sit for a few hours, then rinse thoroughly.
Storage
- Store the flask with the lid slightly ajar to allow air circulation and prevent moisture buildup and odors.
- Store in a dry place, away from direct sunlight and extreme temperatures.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Beverage not staying hot/cold | Lid not sealed properly; Flask not pre-heated/chilled; Damaged vacuum insulation. | Ensure lid is tightly screwed on. Pre-heat/pre-chill the flask. If problem persists, contact customer support. |
| Leakage from lid | Lid not screwed on tightly; Silicone seal is dirty or damaged. | Ensure lid is securely tightened. Clean the silicone seal. Inspect seal for damage; if damaged, contact customer support. |
| Unpleasant odor inside flask | Improper cleaning; Stored with lid closed. | Clean thoroughly with baking soda and warm water. Store with lid slightly ajar. |
Specifications

Image: Diagram showing the Tescoma Constant 1L Vacuum Flask with a diameter of 7 cm, a capacity of 1.0 L, and a height of 31.5 cm.
- Brand: Tescoma
- Model Name: Constant
- Item Model Number: 318526
- Capacity: 1000 Milliliters (1 Liter)
- Material: Stainless Steel (flask body), Plastic (lid/cup, closure mechanism)
- Product Dimensions: Approximately 3.78 x 3.35 x 12.52 inches (9.6 x 8.5 x 31.8 cm)
- Item Weight: Approximately 14.8 ounces (420 grams)
- Cap Type: Screw Cap with one-touch closure
- Included Components: Flask, Lid/Cup
- Product Care Instructions: Hand Wash Only
- Special Feature: Break-resistant in normal use, silicone seal for one-touch closure.
Warranty and Support
Warranty Information
The Tescoma Constant 1L Stainless Steel Vacuum Flask is covered by a 5-year warranty against manufacturing defects under normal use. This warranty does not cover damage caused by misuse, accidents, or unauthorized modifications. Please retain your proof of purchase for warranty claims.
Customer Support
For any questions, concerns, or warranty claims regarding your Tescoma product, please refer to the contact information provided with your purchase or visit the official Tescoma website for customer service details.




