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Insulated vacuum flasks are a key component of all multiday outdoor journeys. I'm interested in their performance in the extreme cold, so have come up with a twopart test for three well regarded models. This second half brings us up to date with two new models, and then completes an Arctic test at 20 degrees over a period of nine hours.

Products mentioned:

Sigg Hot and Cold 1.0L (official/actual weight 730g)
Klean Kanteen TKPro 1.0L (actual weight 700g)
Thermos Ultimate Flask 900ml (actual weight 390g)
Stanley Adventure Flask 1.0L (actual weight 650g)
YETI Rambler Bottle 1.065ml (36oz) (official weight 620g)

Feel free to ask any questions in the comments!

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Thanks to https://vanguardstorage.co.uk/ for warehousing facilities.