I'm looking to build a 20* custom wooki XLC and the price difference between the 850 and 950 fill is significant ($63) if I get no overfill. If I get 1oz of overfill, which I'm inclined to do, it's a $70 difference.

I'm not a thru hiker, but I am a weekend backpacker, and I do like to save weight where I can. I'm looking at maybe a little over 1oz weight savings, which is not worth the money to me, but I do like that it would be a little more compressible. I currently have a 20* wooki for my blackbird (regular, not an XLC) and it's pretty big to pack. I don't know how much of a difference that fill will make though.

Thoughts?