Little-known hack can get £30 Ninja leak-proof travel bottle slashed to £9 The Ninja Thirsti is a 530ml capacity travel bottle which has been specifically designed to keep drinks at their optimum temperature for longer and it's currently on sale Shoppers can save £25 on the water bottle (Image: Ninja ) As the weather warms up, many of us are swapping our hot drinks for cold ones. The Ninja Thirsti travel bottle has been praised by hundreds of shoppers for its ability to keep drinks both hot and cold. Now, bargain hunters have found a way to get this popular item for 71% off its usual price by combining deals. With payday just around the corner for many UK workers, brands like Boden, LookFantastic, Shark, and Debenhams have all launched flash sales. These sales offer everything from summer essentials for women to SPF and garden furniture. Ninja joined in on the trend with a surprise sale offering 20% off selected bestsellers. This includes their latest FrostVault cooler range and the already-discounted 3-in-1 Food Processor. Shoppers can access these discounts by using the code PAYDAY at checkout, reports the Mirror. READ MORE: Boots' new £34 beauty box saves shoppers over £100 on Estee Lauder, No7 and more READ MORE: Next's £36 stretchy jeans in five colours shoppers say 'fit extremely well However, savvy shoppers have discovered a way to get the Ninja Thirsti travel bottle even cheaper. By stacking the sale code with an additional offer, they've managed to reduce the price from £29.99 to less than £9. TopCashback, a money-saving website, is offering new customers a free £15 cashback bonus on their first purchase, as well as a percentage back on qualifying spends across thousands of online retailers including big names like Next, Boots, Ninja and more. By combining these two deals, shoppers can get the 530ml Ninja Thirsti for a fraction of its usual price, bringing it down to £8.79. There's also a larger 700ml capacity bottle usually priced at £34.99, which shoppers can grab for £12.76. How to claim a Ninja Thirsti for £8.79: Go to TopCashback and sign up as a new member. Search for Ninja, click 'Get Cashback Now ' and purchase as normal. Shoppers get £15 cashback on a spend of £15 or more on any item including either the 530ml or 700ml versions of the Ninja Thirsti. Cashback will then track and appear in members' TopCashback account within seven working days of purchase. After cashback is paid the small size bottles effectively work out at £8.79 while the larger size will be £12.76. Ninji's popular Thirsti water bottle is back in stock (Image: (Image: Amazon) ) The Thirsti is available in five different colours, from classic white, grey and black to more vibrant mint green and blue. Ninja, as a brand, prides itself on reinventing classic products and the Thirsti is no exception - it features three layers of vacuum-insulated stainless steel that keeps drinks at their ideal temperature for longer. According to the brand's tests, it can keep cold drinks chilled for up to 24 hours, hot drinks warm for up to 12 hours, and ice intact for up to two days. Additionally, the BPA-free, leakproof bottle comes with a five-year guarantee. Multifunction cups are not exactly a novelty, as the eco-brand Ocean Bottle's 3-in-1 offers an alternative. It can be personalised, comes in various colours, and includes three different lids (one for everyday sipping, one with a straw, and a hot-drink friendly brew lid). Plus, each sale helps remove 1,000 plastic bottles from the ocean, making it a rewarding buy. OceanBottle's 3-in-1 comes with interchangeable lids for sipping hot drinks, cold drinks and a straw option too (Image: Ocean Bottle ) The standout feature of Ninja's bottle, apart from its slightly smaller 500ml capacity compared to Ocean Bottle, is its claim to keep fizzy drinks more effervescent for longer, preserving the sparkle in carbonated beverages. It seems scores of satisfied customers concur, with the Thirsti racking up over 400 reviews on Ninja's website since its debut, boasting an impressive average score of 4.6 out of 5. A whopping 92% of buyers would suggest getting this bottle. One customer remarked: "At last, a reusable bottle that can be effectively used for sparkling water. No tainted taste or degradation of gas makes this a really welcome product." Another shared their experience: "I bought this to replace my old insulated drinks flask. This feels a solid and quality product and stylish too. Keeps cold drinks really cold all day and doesn't take on flavours of the last drink which is important as I mostly have water." A satisfied customer praised the Thirsti, remarking, 'the best bottle,' and sharing: "My morning coffee made at 7am was still hot at 3pm. As a busy mum and nurse I'm used to having lukewarm/cold drinks so the Thirsti has been a game changer. Even better, I can come home and chuck it in the dishwasher. The bottle is also a great size for travel as its fits in the car cup holders." However, not everyone was impressed, with a three-star review noting: "Very well built, and robust. Unfortunately, whilst it is good for fizzy drinks, hot coffee became very lukewarm within 4-5 hours." Article continues below The adaptable Thirsti bottle is now available with 20% off during Ninja's time-limited sale which ends at 11.59pm on Wednesday, April 30. This discount means shoppers can snag it for less than what it's going for on Amazon (£30) or Robert Dyas (£24.99).