24Bottles Urban Adults’ Unisex Bottle, unisex_adult

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It is important to think about what you will be using the bottle for, as well as the materials used and if they are environmentally friendly,” says Byrne. She notes that the main reason people choose to buy a reusable water bottle is to cut down on single-use plastic and help the environment, so it makes sense to choose a bottle that is environmentally friendly, like the plant-based S’wheat bottle.

In a departure from the traditional Chilly’s style, this brand new water bottle has a stainless steel straw with a sporty flip lid and carry loop, designed for use on the go. It comes in either 500ml or a litre.

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The body curves inwards around three quarters of the way up so you can wrap the rest of the hand around the body as you press the lid. I’d suggest it really needs to be a little higher, though I do have small hands. But the brand’s popularity isn’t all down to its fun designs; S’well bottles are everything you could want in a water bottle. They’re BPA-free, made from long-lasting stainless steel and keep water cool for up to 24 hours thanks to a clever vacuum design. They also keep liquids hot for up to 12 hours so they can be used as both a water bottle and a travel mug. A S’well bottle is far from cheap but is well worth the money if you’re able to splash out, especially if an attractive bottle is likely to make you sip from it more frequently. Jocelyn Ivanov, MIT, Drinking fountains: the past and future of free public water in the United States, September 29, 2015

Unlike other sports bottles, it’s also beautifully designed. I love the blue linen colour (shown above). The powdered coating means it doesn’t slip, even with sweaty hands, and the ridged edging on the lid makes the cap easy to twist off. The rather large branding down the side is a turn off for me, though at least it’s subtle in colour. That said, Lululemon is a prestigious fitness brand which I imagine many would be proud to show off. I’m a long time fan of Chilly’s Original Bottle and I’ll admit I was dismissive when the Series 2 bottles first came out. They’re objectively less attractive than the classic design of the Series 1, with a more rugged, squat appearance and a loop handle. But I’m here to tell you I’m a convert. BPA stands for Bisphenol A, an industrial chemical compound used in the manufacturing of strong plastics. Some research suggests BPA can leak into food and drink and cause health problems. “When looking for a bottle, look for non-toxic materials. Stainless steel is one of the most eco-friendly materials for a water bottle. Not only is it safe, but it is very durable and infinitely recyclable,” says Natalie Byrne, content marketing manager at Go Outdoors. Stainless steel is a reasonable option for a sustainable water bottle as it’s 100 per cent recyclable. Plastic uses oil and water in the production and releases carbon dioxide, a greenhouse gas, but can be more environmentally friendly if it is recycled. S’wheat is the most environmentally friendly reusable water bottle, because it is made from biodegradable plant-based materials, bamboo and wheat straw, which would otherwise have been agricultural waste. The company also plants a tree with every sale, takes plastic out of the oceans and donates a percentage of its profit to protect sea life.

Born in Bologna, Italy.

Looks wise I can’t complain either. The Hydro Flask features a compact design with a powdered coating and a choice of nine colours. My favourite was the rain colour, a pale blue. The bottom is slightly indented in the middle for a stable base and after a month of using it, I can confirm it’s durable and keeps water ice cold. Some water bottles are dishwasher safe but it is still important to clean the smaller parts with a toothbrush or bottle brush, especially those with built-in straws. If not washed properly, bacteria like E. Coli can grow inside water bottles and lead to gastroenteritis. Mould can also start forming in unwashed bottles. How long can you keep water in a reusable water bottle? Jenna Bilbrey, BPA-Free Plastic Containers May Be Just as Hazardous, Scientific American, August 11, 2014 Most companies say they can keep water cold for 24 hours and hot for 12. We wouldn’t recommend keeping water in your bottles any longer than that as it can start to take on a stale taste. That said, you can safely store tap water for up to six months, according to Healthline. Which are the safest water bottles to buy?

The lip, for me, is well sized. If it’s too large, you risk spilling water all over you clothes; too small and it’s not a comfortable fit for the mouth. Chilly’s is just right. I also find that, while some steel bottles can leave a slight lingering metallic flavour, these ones don’t. I like the textured feel of the bottle, which makes it a little less slippery than some steel options and prevents it feeling too cold or hot to the touch. Water stays hot for a long time – though I’m not sure about the 12 hours claim – and remains cold throughout the day; ideal if you’re on a long walk or a hike.Johanna R. Rochester, Ashley L. Bolden, Bisphenol S and F: A Systematic Review and Comparison of the Hormonal Activity of Bisphenol A Substitutes, Environmental Health Perspectives, July 1, 2015

Binchotan Charcoal (also used in high-end barbecuing) not only filters out impurities like chemicals and metals but also imparts healthy minerals like potassium. Tangibly, this means tap water is eradicated of bad smells and tastes like bottled water. It takes around eight hours to do so, meaning you’ll get the best results filling it the night before.

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If you’re buying a reusable water bottle with the intention of becoming more environmentally friendly, it doesn’t get more sustainable than the S’wheat bottle. The S’wheat is a reusable plant-based water bottle made from wheat straw and bamboo. The wheat straw is the stalk part of cereal plants which remains after they’ve been harvested. Usually, wheat straw would be used as biofuel, animal feed or burnt in the open - causing pollutant emissions. Now I’ve got the negatives out of the way, I can talk about why I love the bottle. I have it in taupe, shown above. The powdered body is top and tailed by stainless steel bands with a small logo at the bottom. The lid has a large handle which can be grabbed with a whole fist and under that is what they call their ‘Chug Cap’. It’s a shatter-resistant plastic lid with a large chug opening in the middle for gulping water on the go. Any BPA free water bottle, like all the ones above, are safe. Exposure to the industrial chemical BPA is believed to cause health problems, as I have explained in more detail in the introduction, but thankfully manufacturers are extremely cautious to avoid it these days. Glass and stainless steel are both naturally BPA free. If you’re particularly safety-conscious with your water, consider buying a filtered water bottle.