In the manner of the PHD racing bag and the Patagonia Hybrid
https://www.patagonia.com/product/hybri ... rt=1&sz=24
I find a sleeping bag with a 1520mm internal girth tight when wearing base layers and 1650mm tight when wearing any of my insulated tops and I was thinking of modifying one of my older cheaper sleeping bags to this style to save weight. My question is to do with the windshell top. How big is too big? Does it really matter if i have an extra 150mm of UL fabric here?
If the model in the Patagonia photos is their standard male he is 184 tall and normally wears a size medium so you can see how tight the Patagonia Hybrid is