ECOtanka thermoTANKA 350ml Double Wall Vacuum Bottle

The thermoTANKA 350ml bottle is designed for kiddies, or for adults who want a bottle which will fit into a small bag or handbag. It holds a volume of 350ml (one large glass) and ideal for keeping your milk cold well on the go, measuring approximately 152mm from the bottom to the top of the stainless steel area.  The vacuum properties of the thermoTANKA can keep your drink hot for 6+ hours and cold for 12+ hours.  

thermoTANKA fits all of the standard ECOtanka lids (except the megaTANKA lids) and adaptor lids are also available to fit a range of teets, so the thermoTANKA can also be used as a safe BPA free bottle for your baby:

ECOtanka thermotanka 350ml with stainless steel bamboo lid

thermoTANKA 350ml
w/S.S. bamboo lid

Finish: Brush Stainless Steel
​​​​​​​Material: Stainless Steel 304 18/8
Logo: Black Laser

ECOtanka thermotanka 350ml with stainless steel Modern lid

thermoTANKA 350ml
w/S.S. modern lid

Finish: Brush Stainless Steel
​​​​​​​Material: Stainless Steel 304 18/8
Logo: Black Laser

ECOtanka thermotanka 350ml with poly loop lid

thermoTANKA 350ml
w/poly loop lid

Finish: Brush Stainless Steel
​​​​​​​Material: Stainless Steel 304 18/8
Logo: Black Laser

ECOtanka thermotanka 350ml with adaptor lid

thermoTANKA 350ml
w/adaptor lid

Finish: Brush Stainless Steel
​​​​​​​Material: Stainless Steel 304 18/8
Logo: Black Laser

ECOtanka thermotanka 350ml with adaptor lid with teet

Baby teet

The ECOtanka Adaptor lid can be fitted to any bottle within the 350ml to 800ml range.  The Adaptor can fit most standard baby teets so that you can buy the right one and the right brand to fit the Adaptor to use a stainless steel bottle for your baby. 

thermoTANKA History

ECOtanka designed the thermoTANKA in 2008 and made the first bottle in 2009.  Since then everyone liked the design and copied it, you can now see our design everywhere!!  The thermoTANKA was originally designed to keep drinks colder longer due to the insulation function of the vacuum, but people like it so much they now keep hot drinks in the bottle.  One bottle for summer and winter!

Bottle Specifications

The specifications in this page are only for the thermoTANKA 350ml bottles and do not include the lid or kooler cover specs.  To view the material specifications for other product parts for this bottle, please visit each product page.

​​​​​​​This product is made from Stainless Steel 304 18/8 (1.4301), Austenitic steels.
The material contains 18% Chromium and 8% Nickel
The product material is FREE from Lead and other contaminants.
This product does not contain an internal coating and is FREE from any other chemicals.

All of our materials are tested once every 5 years with an independent supplier SGS Shanghai China.  All material batch orders are tested within the factory and all individual orders are self tested by our own team in China using two methods as follows:

1. A stainless steel liquid colour test to confirm the stainless steel type.
2. A spectrometer test which takes an analysis of the material makeup to verify its quality.

Stainless Steel Origin:  China

Bottle height:  152mm +/- 0.4
Bottle Weight: 180grams +/- 5g

Bottle Diamater: 73mm
​​​​​​​Bottle Opening: 44mm
Bottle thinkness outter layer: 0.5mm +/- 0.02 (material used)
Bottle thinkness inner layer: 0.4mm +/- 0.02 (material used)

​​​​​​​All painted bottles are painted with a non-toxic environmentally friendly paint.
Bottle paint type: Standard transparent gloss finish

Logo Silk Screen Print: Printed using a high quality non-toxic environmentally-friendlly German paint/ink.  A hardener is also added to the paint/ink to make it set stronger and more durable.

​​​​​​​ECOtanka values quality. In order to make sure that our products are 100% safe for you to use and long-lasting, we carrry out a material test every 5 years by an independent third-party lab.  All parts of ECOtanka products that come in contact with your liquid or food are tested.  

The materials we test are as follows:
- Stainless Steel for Bottle material
- Silicone for Seal material
- PP for Plastic Lid material
- Stainless Steel for Lid material
- TPR for Sports Lid's Sipper part material

Our testings are mostly as per EU standards. From time to time, we carry out FDA testing as well.  As testing samples , we provide one product type for each material category. 

To view our latest test results, please click on the following document below:
2018, July SGS Report ​​​​​​​
​​​​​​​2018, July BV BPA & BPS Report

Care Instructions:

ECOtanka bottles are very easy to care for: simply wash and rinse well the same as for your dishes.   Alternatively, baking soda and warm water can be used to cleanse and freshen your bottle.  They may be sterilised with boiling water.  Do not place in the freezer.
We do not recommend washing any stainless steel bottle in your dishwasher. For more detailed care instructions, please click here.


The packaging for all ECOtanka products is 100% Plastic-FREE and environmentally-friendly. From Factory to End Consumers, Less Packaging Waste.
To learn more about our packaging, please click here.

2 Year Warranty

All ECOtankas come with a 2-year warranty against faulty manufacturing.  If you have a problem with your bottle or lid, you can contact us or find out more information here:

Summer Tip:

To make a drink that stays cool for hours in summer, simply fill your bottle with ice cubes, top with water.  All ECOtanka bottles have a special wide mouth, allowing ice cubes to be used for an instant cold drink.  Please do not place your ECOtanka 350ml thermo bottle in the fridge or freezer it will not work.