"Bivvy"..."bothy"...."vindsäck"... In my opinion the difference is mainly semantics.
In all cases we are talking about a simple, extremely lightweight, one layer, wind and rain proof shelter. They protect you from the wind, keep you dry, and somewhat hold in body heat. North Americans most often seem to call them "bivvys" while Brits usually use the term "bothy".
Hmm not sure about that.
A bivvy bag is a weatherproof outer for a sleeping bag.
I would expect a properly equipped climber would have both a bivvy bag to sleep in, and bothy to provide larger shelter.
Stopping for a quick brew, a bivvy isn't going to provide much protection.
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