Bottle Metal (500ml)

 The flask in the image is grey, but other colors like blue, black, and gold may be available.

Look for features like double-wall insulation for temperature retention (hot or cold for up to 12 hours), leak-proof design, and material (often stainless steel). 

These flasks are designed to be portable and suitable for various activities like hiking, biking, shopping, or office use. 

Using a vacuum flask can be eco-friendly by reducing reliance on single-use plastic bottles and cost-effective in the long run