Stanley has just launched a brand-new addition to its line-up of Quencher tumblers.

Unlike previous models, the latest drinking cup is completely leak-proof and it’s available to buy online now.

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Quencher ProTour Flip Straw Tumbler, £50

Fun fact: 112-year-old brand Stanley can lays laim to inventing the world’s first steel-insulated drinkware.

Its TikTok sensation, the FlowState tumbler, has become one of the superstar products of recent years.

But the Quencher ProTour Flip Straw Tumbler is the first follow-up device with a significant design upgrade.

The previous versions have issues with leaking (Stanley has never claimed against this), but this new tumbler is marketed as completely leakproof.

The new model features a flippable straw lid and, like the original FlowState, has a 1.2-litre capacity.

Also like the classic Quencher, it has double-walled stainless steel construction to keep drinks chilled for several hours, making it perfect for workouts and daily hydration.

Stanley is no doubt targeting this new release at the New Year health kick crowd.

Unlike the original, which is intended to go into the drinks-holder of a car, the ProTour looks like it’s ideal for anyone who wants to sling it into their gym bag without worrying about a pile of sodden clothes.

It comes in five colours: Black Fade, Frost Fade, Rose Quartz Fade, Ash Fade, and Azure Fade.

After a successful launch in the US, the new ProTour is now available to buy in the UK.

Stanley ProTour Flip Straw tumbler: price

You can buy the Quencher ProTour Flip Straw Tumbler now from the Stanley 1913 website for £50. 

That’s the same cost as its predecessor, the classic FlowState. 

Unless you choose next-day delivery, shipping is free of charge, and will take between 2 and 4 days. 

Are Stanley Quencher cups leakproof?

The original Stanley FlowState Quencher cup isn’t leakproof. A couple of Sun writers own the tumbler.

Consumer reporter Lynsey Hope, tried using the Stanley Cup for a week, and found that it did spill every now and again.

‘[It] might be a dealbreaker for some,’ she writes. ‘When tipped to the side, a bit of water does drip out. To be fair, Stanley don’t advertise it as leakproof.’

In her Stanley Quencher review, Zoe Bennetts says: ‘[The cup’s] design means that the seal works incredibly well to prevent leaking, however it does have a straw which is where mine tends to leak.

‘As long as you keep the Quencher upright, it’s fine.’

In contrast, the new ProTour Flip Straw tumbler is marketed as 100% leak-proof.

Given that both cups are the same price, it seems highly likely most shoppers will gravitate towards the leak-proof ProTour.

The Sun’s Shopping team hasn’t got our hands on the latest Stanley Quencher – but it’s already in the post. We’ll keep you posted.

Quencher ProTour Flip Straw Tumbler, £50