HYDRO FLASK - Travel Coffee Mug 177 ml (6 oz) - Vacuum Insulated Stainless Steel Travel Mug with Handle and Press-In Lid - BPA-Free - Black

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Hydro Flask’s Parks For All giving programme supports non-profit organisations focused on the building, restoring, and investing in public green spaces so people everywhere can live healthier, happier and more fulfilled lives. But typically, the best material for a flask is stainless steel due to its excellent durability qualities. Textured coatings are useful – it’s a nice touch to have a handle on a drinks flask but generally, for a one-litre flask, it’s more useful to have a textured coating that provides grip. 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

No consumer health risk from bisphenol A exposure, European Food Safety Authority, January 21, 2015 You’ll get the best thermal performance by putting your Hydro Flask in a place that’s cool when it’s filled with something cold or a place that’s warm when it’s got something hot inside. In the heat of summer, your ice water will last a lot longer if the bottle is in the shade instead of direct sunlight. Likewise, don’t expect your coffee to stay hot for hours if you leave your travel mug on a snow-covered sidewalk as you shovel the driveway. A little common sense goes a long way in reducing the rate at which your Hydro Flask will reach temperature equilibrium with its surroundings. How We Tested We dropped each flask five times from 90cm to mimic a dropped flask. Those with large dents that inhibited function or ability were rated low. Stainless steel is also cost effective and helps to prevent unwanted odours seeping into your delicious coffee drink. Jocelyn Ivanov, MIT, Drinking fountains: the past and future of free public water in the United States, September 29, 2015

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Pay attention to details like leak-proof seals, insulation technology, comfortable grips, and easy-to-use lids.

None of the flasks leaked from the main body – however, some flasks can't be filled to their stated capacity without liquid coming out when you screw on the lid. Flasks are more 'smell prone' than 'stain prone' – none of the flasks we tested had any staining after cleaning, but some retained a faint coffee smell. Jenna Bilbrey, BPA-Free Plastic Containers May Be Just as Hazardous, Scientific American, August 11, 2014 Plus, you don’t have to worry about staining your newly bought flask. What is a good quality thermos?Look for flasks with excellent heat retention, sturdy materials like stainless steel, and are known to be long lasting. This does depend on factors like the flask's insulation technology, the size of the flask, the starting temperature of your coffee, and how frequently you open the flask.