bike water bottle:which doesnt warm in sun

cycleofusa2010

Hi

anyone able to help me find a water bottle that stays cool despite being subjected to warm conditions?

cant seem to find any?any recommendations?

http://www.wiggle.co.uk/c/cycle/7/Bottles/

jwshooter

quater fill your bottle with water and freeze it ,half fill if your out longer .top up with water when your going out.

works well you will find

blorg

On an early morning ride a few weeks ago I found my second water bottle had frozen

In hot countries I tend to put ice cubes in the bottle. This is not a hot country.

The tax man

15th March Lidl. Worth a punt at €3.99.

I presume they fit on a bike.

IM0

Zefal make a thermos one, does the same job as a flask, keeps things whatever temperature you put them in at hot or cold, bought mine in france while touring there, problem is its a huge bottle (in relative terms) and most of it is insulation, so in reality although it looks like the volume will hold about 1.5l it actually only holds about 1/3 to 1/4 of that!

I found to be more hassle than worth, so changed back to normal ones

petethedrummer

The OP is planning to cycle across the USA, its not for here.

at1withmyself

I have one of the following and am happy enough with it:

http://www.chainreactioncycles.com/Models.aspx?ModelID=5655

It is the size of a 750ml bottle and the capacity is 500ml. If your going with a bottle like this then you have to comprimise on the volume of liquid you can carry.

For really hot weather in the states last summer i bought an insulated Deuter Camel Bak style bag:

http://www.chainreactioncycles.com/Models.aspx?ModelID=35346

Worked really well and kept liquid cool for upto 4 hours, only problem is the straw/hose part is not insulated so the first mouthful is a bit warm but then you get nice cool liquid after. You could add some ice cubes to keep even cooler but I never tried that.

ten speed racer

What about the Camelbak Chilljacket? It seems to store more liquid than other thermal bottles.

I've never used it myself, but I do like regular Camelbak bottles

blorg

I've done a fair bit of cycling in hot countries (up to 50C, the tarmac was melting) and while cool water is certainly nice to have I don't find it essential for hydration. Warm water works for me. YMMV.

Lumen

It takes 50 (k)calories to warm 1 litre of liquid water from freezing to 50 degrees C, so taking in 1 litre of ice cold water will give you only 50 (k)calories of cooling relative to an ambient drink.

Conversely, an extra 500ml of water will give over 500 (k)calories of cooling when you sweat it out.

It's a bit academic since you can't consciously regulate how much you sweat, but shows that cool drinks are not a very effective way of regulating your body temperature. This is the same reason that reusable "ice cubes" don't work very well - phase changes are key.

I like the frozen quarter of a bottle idea, although it's probably best to freeze it horizontally to avoid creating a floating plug in your bottle. And you need access to a freezer (or a decent amount of CO2).

Nietzschean

Lumen wrote: »

This is the same reason that reusable "ice cubes" don't work very well - phase changes are key.

reusable ice cubes make use the of the same phase change that normal ice cubes do.... they just normally have an plastic outer shell which makes thermal transfer a bit slower i imagine...

Lumen

Nietzschean wrote: »

reusable ice cubes make use the of the same phase change that normal ice cubes do.... they just normally have an plastic outer shell which makes thermal transfer a bit slower i imagine...

Ah yes, I was thinking more of these.

cdaly_

Hmm, I wonder can you get a terracotta bottle?...

ROK ON

A friend of mine who trains teams and has a sports science background recommends against very cold water for rehydration.

biomed32

Lumen wrote: »

I like the frozen quarter of a bottle idea, although it's probably best to freeze it horizontally to avoid creating a floating plug in your bottle. And you need access to a freezer (or a decent amount of CO2).

As being from a scientific background I would say dry ice, the more fun aspect would be to chill your bottle with a CO2 extinguisher