It seems to mainly be a UK thing that everyone carries a 'dalesman international' survival bag.
They are simply very large (sleeping bag size) very thick, orange plastic garbage bags. They fold down to a letter size * 1/4" thick package, are reusable and only cost around $5.
The plastic bags are intended to be used as an emergency shelter. They do work reasonably well. The bright orange also makes you very visible.
Contary to popular opinion, mylar blankets are worth carrying because they are very effective as a waterproofing layer for a shelter. You get a lot for a very small weight and pack size. They can also be used in a desert enviroment to improve protection from the sun.
Yes they are noisy. Too bad.
Better to loose a night's sleep as the price of being warm and dry. The alternative won't leave you in any fit state to complain. Ever.
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