12 hour heat retention test on 5 flasks

It was the Fire and ice box that set the challenge, HOT 12 HRS COLD 24 HRS so at 7am on Friday 6th April we took five flasks and filled them with boiling water, recorded the start temperatures and left them outside for twelve hours before opening them up and taking the temperatures again. The heat losses are shown in the table below.

The flasks are from left to right

Mizu Adidas Terrex 650ml / 22oz

#mizulife http://www.mizulife.com

Hydro Flask 532ml / 18oz (New)

Hydro Flask 532ml / 18oz (Old)


Chilly’s 500ml


Fire and Ice 500ml


Please note that the tests where not carried out in the lab but in the great outdoors!

As Spring progresses here in the United Kingdom we will look forward to a hotter day to test the COLD 24 HRS challenge on all five flasks in a similar fashion.

Both the Chilly’s and Fire and Ice were purchased. The Mizu and Hydro Flask were given to us free of charge for review.

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