Thermos Flask to fit standard bottle cage

[raleighnut]

A true Scot would have one of these
http://www.charliethebikemonger.com...ster---seat-mounted-hip-flask-cage-3598-p.asp

I like the concept but I'd be worried about losing my hipflask, now if it sat on the handlebars where I could keep an eye on it.
I keep mine in the zipped pocket of my cycling top.

 

[mjr]

All flasks containing hot liquids get warm on the outside: fact. Your are confusing theory and practice. A flask on a bike is in a stream of (cold) air all the time. I would be astounded if it did not cool significantly faster than a similar flask all snuggly in a rucksack.

Maybe faster but I doubt it's significant in most applications. The main points of heat transmission will be the plastic mountings of the inner flask in the outer shell and they're usually tiny so the difference will be insignificant, plus the cap arrangement and a thick multipart metal and plastic cap on a bottle cage flask insulates better than the thin plastic ones on camping flasks. It's certainly sufficient to keep coffee scalding hot for 3 hours

 

[G3CWI]

Maybe faster but I doubt it's significant in most applications

You would think that but the walking magazines often compare the heat retaining properties of vacuum flasks of broadly similar construction and get widely varying results.

 

[G3CWI]

flask that feels warm to the touch usually contains a liquid best described as tepid.

Agree 100%!

 

[jefmcg]

So I just did a quick test with my one of these. I filled it with boiling water and put it outside. Not against metal, and not very cold - Met office says it's 12C now. After 3 hours, the outside was cold to the touch (yay) and the liquid was very hot. Not scalding, just reduced enough to drink without burning the mouth.

(for £6, I might pick up another one if/when I pass a Kathmandu)

Just noticed the flask still sitting on the kitchen table, 15 3/4 hours after I filled it with boiling water. Water is still drinkably warm. That's better than most thermos flasks.