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Insulated bottles don't have to be just for the summer. As morning commutes get colder, shoppers wanting to take their coffee or tea with them to work can now invest in a top-rated Ninja travel bottle for under a tenner by combining two deals.

The popular Ninja Thirsti is currently on sale on the retailer's website, down from £29.99 to £24.99, but savvy shoppers can get it for far less if they join TopCashback, according to the Birmingham Mail.

New members to the money-saving site get a £15 signup bonus plus cashback, which would drop the water bottle's price to just over £9. They can snap up the Ninja Thirsti water bottle for £9.12 after cashback, while existing TopCashback users can still make savings, with the bottle costing effectively £24.12 after cashback.

All shoppers have to do is sign up to TopCashback using this link, then search for Ninja and make the purchase through the website. Cashback will appear in their TopCashback account within seven working days.

The Ninja Thirsti is an insulated travel flask with a 530ml capacity that claims to keep hot drinks warm for up to 12 hours. In hotter weather, it claims to keep cold beverages chilled for up to 24 hours and ice frozen for two days. The bottle also claims to maintain the fizziness of soft drinks.

The brand says the lid is leak-proof, eliminating worries about spills. It's available in a variety of shades, although at the moment, only white, black, grey, blue, and mint are on sale.

The Ninja Thirsti is popular online, with one former "sceptic", now a fan, saying: "This has to be the best water thermos I've ever used." They added: "It easily keeps coffee hot enough to drink for a full shift (8hrs) as well as keeping ice water very cold all day too."

Another wrote it was a "great flask" that "keeps fizz in drinks". As for hot drinks they said, "wow do they stay hot".

A third who used it to carry coffee said: "I would say it stayed around the same temperature for a good 7-8 hours. I did leave some coffee in overnight and it was still hot enough to drink the next day, so although it does keep cold drinks cold longer, it is still excellent for hot drinks."

Some shoppers commented that the size of the flask didn't work for their needs. One wrote: "It's not too good for work as it doesn't fit in the cup holder in a van that I drive for work." However, the same review says that "other than that it keeps my green tea hot/warm all day".

• To claim the cashback deal, new members of TopCashback need to sign up here.
• Search for Ninja and click "Get Cashback Now".
• Shop and check out as usual.
• Cashback will then appear in your TopCashback account within seven working days of your purchase.

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