200g, 300g and 1 kilo? Thinking about it if some sort of shelter is found then complete waterproof resistance is not required. Pertex wins.
SOL bivvy - 108g
http://www.ebay.co.uk/itm/SOL-Survive-Outdoors-Longer-Heatsheets-Emergency-Bivvy-Survival-Sleeping-Bag-/221844003169?hash=item33a6eed961
http://www.ebay.co.uk/itm/SOL-Escape-Lite-Bivvy-Ultralight-Minimalist-and-Emergency-Survival-Shelter-/331633918378?hash=item4d36ec01aa
@Spares started
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200g, 300g and 1 kilo? Thinking about it if some sort of shelter is found then complete waterproof resistance is not required. Pertex wins.