not a coffin insulation below you is always squished, so doesn't loft, so doesn't keep you warm, so is pointless footbox is less restrictive accomodates people that sleep on their side or front etc etc
How well do they work with bivvy bags?
works fine, but the clever move is to throw your bivvy away and get a tarp + groundsheet
@Mickie_Cricket started
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not a coffin
insulation below you is always squished, so doesn't loft, so doesn't keep you warm, so is pointless
footbox is less restrictive
accomodates people that sleep on their side or front
etc etc