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I like to travel light, passport, visa card, shorts, toothbrush toothpaste. So a simple chip would get rid of the passport and visa card. (that's my first desire).
Secondly a stillsuit (dune) able to collect perspiration, urine, sea water and filter it for reconsumption. The suit would also be sealskin (not from a seal) It's a material that stays dry. They make socks and gloves but really need to make tryathlon wear.
I'm in the midlands and just getting into the subject area