If this heatwave has taught me anything, it's the value of keeping your drinks cool

In the UK, we've been dealing with multiple unseasonable heatwaves, and if it's taught me anything, it's that hydration is important — and so is keeping your drinks at the right temperature. It's a small thing, but many times over the last few days, I've taken a sip from a bottle in my bag and grimaced, as my cheap non-insulated, single-layer metal screw-top bottle just isn't keeping anything cool.

Fortunately, thanks to the Amazon Prime Day deals, I'm coming prepared next time. I'm ordering myself a Yeti Rambler 42oz Straw Mug. Yeti are the gold standard of keeping things cool (and hot), and Amazon is doing some particularly good deals on their Tumbler shape right now.

• Browse the full Amazon Prime Day sale

In the US, you can get the Yeti Rambler 35oz Straw Mug at Amazon US for $29.40 (was $42) in its White and Papaya colors. In the UK, you can get a slightly larger discount: the Yeti Rambler 42oz (1.5L) Straw Mug is available at Amazon UK for £29.25 (was £45) in Navy and Key Lime colours.

Check out both deals below:

Today's best Amazon Prime Day Yeti deals

The Yeti Ramblers are ideal for the gym, but they'll really shine on a long commute or car trip too, as you can pop a cold drink in them, head out the door on your way to work, and still be sipping refreshed at midday. I've ordered the larger 1.2L version because, as a fitness writer, I'm apparently supposed to be keeping myself hydrated.

More Prime Day deals in the US

Amazon Devices: Fire Sticks & Echo from $18

Amazon Haul: viral gadgets, tech & appliances from $1.99

Apple: MacBooks, AirPods & AirTags from $29

Beauty: 50% off toothbrushes & hair tools

Cheap TVs: smart TVs from $69.99

Garden: tools, mowers, planters from $24.99

Headphones: 50% off Beats, Bose & Samsung

Laptops: Apple, HP & Dell from $199

Mattresses: Sealy, Serta & more from $186

Patio: outdoor furniture, rugs & decor from $19.99

Sports: 50% off fitness gear, treadmills & clothing

Vacuums: Dyson, Shark & Bissell from $34

More Prime Day deals in the UK

Amazon Prime: get a 30-day free trial

Amazon Devices: Fire, Ring & Blink from £13.99

Amazon Haul: up to 30% off

Apple: up to 33% off AirPods & Apple Watch

Appliances: up to 45% off Ninja & Tefal

Beauty: up to 60% off Philips & Oral-B

Essentials: household goods from £5

Fans: from £20

Fashion: up to 50% off

Gaming: £90 off PlayStation 5

Headphones: up to 50% off Beats & Sony

Laptops: from £149

Tablets: Samsung & Lenovo from £79.99

Toys: up to 25% off Lego and Tonies

TVs: from £129.99

Vacuums: up to 40% off Shark & Roborock

Wearables: up to 30% off Garmin & Oura

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Matt is TechRadar's expert on all things fitness, wellness and wearable tech.

A former staffer at Men's Health, he holds a Master's Degree in journalism from Cardiff and has written for brands like Runner's World, Women's Health, Men's Fitness, LiveScience and Fit&Well on everything fitness tech, exercise, nutrition and mental wellbeing.

Matt's a keen runner, ex-kickboxer, not averse to the odd yoga flow, and insists everyone should stretch every morning. When he’s not training or writing about health and fitness, he can be found reading doorstop-thick fantasy books with lots of fictional maps in them.