I just finished my down blanket. The measurements are roughly like the Nunatak Arc edge. The shell material is Pertex microlight.Fill is 200 gr. of premium down, overall weight is 400 gr including a Spinsack
The I constructed it like some down comforters for indoor use- I quilted it. Formerly I used a sewn through down bag (also homemade) down to below freezing inside a bivy. This time I wanted the ease of construction of a sewn through bag (making baffles is no rocket science but just damn time consuming and I wanted this project to be quick and dirty) with fewer cold spots- so I quilted the blanket. I handsewed the outer and inner Shell together. As you might see the quilted spots are tighter packed at the edge of the Blanket where gravity would let it slide to hence giving it less room to fill there.
After two nights the down has shifted a bit from the top to the sides, but nothing one or two pats with the flat hand can’t correct.
Seems to be a very light construction method with only very few cold spots.
Comments anyone?
Pics (First pic is an oware style Bivy with Quantum top and Silnylon bottom 150 gr.):

