[Low-Tech] [High-Tech] Portable cooling: higher-TL replacement of water jugs?

[vicky_molokh]

Greetings, all!

An unglazed earthenware jug cools its water by evaporation (5%/day), providing +1 to Survival (Desert and Jungle) [LT33]. Looking through High-Tech, I haven't found similar solutions. What would be a good variant container for making a cooling water storage while travelling for this +1, but without risking the fragile jugs of low-tech?

Thanks in advance!

[acrosome]

An insulated thermos full of ice.

[vicky_molokh]

Originally Posted by acrosome

An insulated thermos full of ice.

That requires ready access to ice. Hard to get in a jungle hikevaway from civilization.

[starslayer]

There are multiple evaporative cooling water bottles on the market. They use a hydrophillic gel instead of vulnerable clay. (No copy/paste on my phone but if you look up evaporative cooling water bottle you will have multiple hits)

Peltiers would be able to cool water and be both lightweight and quick. They would not be efficient and would also require power.

[safisher]

Canvas water bags.

[vicky_molokh]

Originally Posted by safisher

Canvas water bags.

Thanks! That's a very interesting thing. I want that for my character. How does the price and mass compare to a standard Wineskin? At what TL did they appear? So far, I've only found one example with an explanation.

[Agemegos]

They were common in Australia at least from 1850 to 1960. Capacity about eight litres, mass about 500 g including an iron hook to hang them by: important, they leak if you rest them on a surface.

A Google search turned up one available for sale now for A$59, but that seems like a gimmicky price to me. I also found a hessian (burlap) one with a vinyl back (that can rest against something and not leak) for A$40.

[warellis]

Would modern hydration packs, like Camelbak, be something similar to what you're looking for?

[vicky_molokh]

Originally Posted by warellis

Would modern hydration packs, like Camelbak, be something similar to what you're looking for?

No, that's both too high a TL, and doesn't use evaporative cooling.

The canvas bag seems to be right what I'm looking for - 'early West' implies that the first examples showed up around TL5 or 6, which is perfect. I'm also quite impressed by the claim of said bag keeps water at twelve degrees. I'm not sure if that's right, but if it is, it's awesome.

[Dustin]

There are also metal canteens with a woolen covering, intended both to insulate the canteen and to cool it via evaporation when wetted.
Examples: http://www.ebay.com/sch/i.html?_kw=scout+canteen+wool