I have a Berghaus Mera Peak 4.0 Jacket about 18mo old, and a 5.0 version that still has its tags. They are great jackets, have never let me down and suitable for my life as a Scout Leader who takes kids up big hills. But I'd also like something that is more packable and just as 'bomber' as the Mera Peak. What fabric is the 'sweet spot' for weight / robustness? Notes: I do have an old lightweight goretex but it's not great for the hills as it's too short in the torso so not great with a pack. I also have a Berghaus smock of some sort, not goretex but breathable. I bought it for summer runs and it's great, but it's too tight when over decently warm winter kit.