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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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. 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. Jenna Bilbrey, BPA-Free Plastic Containers May Be Just as Hazardous, Scientific American, August 11, 2014 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.

Stainless steel is also cost effective and helps to prevent unwanted odours seeping into your delicious coffee drink. Hydro Flask makes beautifully designed gear from drinking bottles and coffee cups to Soft Coolers and the Outdoor Kitchen dining collection. Hydro Flask’s bold and bright range of products and interchangeable accessories are perfect for commuting, camping, climbing - or whatever outdoor activity floats your boat. Jocelyn Ivanov, MIT, Drinking fountains: the past and future of free public water in the United States, September 29, 2015This 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. Plus, you don’t have to worry about staining your newly bought flask. What is a good quality thermos? To find the best Hydro Flasks, we compared six bottles of various shapes and sizes and seven styles of lids, considering the cost, weight, usability, and insulating performance of each. We assessed insulation as follows:

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. Jon Hamilton, Beyond BPA: Court Battle Reveals A Shift In Debate Over Plastic Safety, NPR, February 16, 2015 We hand-washed each flask with hot soapy water and let them air dry overnight, then ranked them on smell.

Since the American manufacturer, Thermos, came to fame, the term has become slang for vacuum-insulated flasks. Although the terms are largely interchangeable, the original scientific phrasing is 'vacuum flask'. Look for flasks with excellent heat retention, sturdy materials like stainless steel, and are known to be long lasting. Button-operated lids are more efficient to use than twist-and-pour stoppers – we found the button-operated lids to be more secure than the twist-and-pour stoppers. All of which we have covered in our list of recommendations. Will coffee stay hot in a Hydro Flask?