I did once try just a synthetic silk liner and down jacket in a bivvy bag. My top half was OK, but my legs really suffered with the wind blowing across the bag. I'd suggest getting something with a decent degree of loft, be that quilt, elephant's foot, down trousers or similar.
I did once try just a synthetic silk liner and down jacket in a bivvy bag. My top half was OK, but my legs really suffered with the wind blowing across the bag. I'd suggest getting something with a decent degree of loft, be that quilt, elephant's foot, down trousers or similar.