Ninja's bottles soared in popularity when the brand discounted them on its own website during the Black Friday period.

They have since gone back up to full price on the Ninja website, however as of today, Amazon has reduced the 530ml version from £29.99 to £19.99.

The new price drop comes just in time for Christmas shopping as it's a great all-rounder gift if you're wanting to spend £20 or less, and could be used for secret santa or a stocking filler.

The Ninja Thirsti is far more aesthetic-looking than some thermal bottles, but it doesn't scrimp on the practical side either. The bottle keeps drinks cold for up to 24 hours, hot for up to 8 hours and retain fizz for hours too, and they're fully leak-proof too.

Amazon says over 1000 bottles have have been bought in the past month, and shoppers have been leaving their reviews on the Ninja product.

One shopper said: ''This is a very sturdy and leak proof bottle. It keeps my drink cold for a long time and is easy to use. Just twist off the top section and re-fill it without hassle. It seals well and comes in various colours. Unlike other metal bottle you don't get that metal taste. It also has a handy grip to carry it around comfortably.''

Another commented: ''Whats not to like? It looks great, it keeps drinks ice cold when needed for prolonged periods, it doesn't leak a drop and it can hold carbonated drinks as well, although they feel like they go a little flat pretty quickly. Love it, would never use another water bottle again (unless Ninja make a better one of course).''

While a third added: ''It has a good seal and so you can store carbonated drinks without pressure building up. They don't really stay v fizzy though.''