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"The science fiction method is dissection and reconstruction. You look at the world around you, and take it apart into its components. Then you take some of those components, throw them away, and plug in different ones, start it up and see what happens."
- Frederik Pohl

Catchpocket  
  A small container in a stillsuit that stored reclaimed water.  

The most important piece of equipment that a Fremen owned on the desert planet Dune was the stillsuit, because it reclaims water from the body.

"...Reclaimed water circulates to catchpockets from which you draw it through this tube in the clip at your neck...
Technovelgy from Dune, by Frank Herbert.
Published by Putnam in 1965
Additional resources -

Here's what it it's like to depend on your stillsuit for water:

"...the ones who carried their pack say there's literjons of water in it. Literjons! And us sipping our catch-pockets the instant they show dewsparkle."

Dune stilltents also reclaimed moisture from the air, and they, too, had catchpockets.

Compare to the water pouches from the transkin from Parasite Planet (1935) by Stanley Weinbaum.

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Additional resources:
  More Ideas and Technology from Dune
  More Ideas and Technology by Frank Herbert
  Tech news articles related to Dune
  Tech news articles related to works by Frank Herbert

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