So I was wondering what fabrics are best to handle tearing on sharp objects? Are all UL fabrics just prone to it, which is why ripstop is a common feature? Even ballistic nylon is just better for abrasion right? My Marmot Arroyo bag (20d nylon) shredded so easily on some jagged metal on a train and I had to sew it in the dark in high winds with down fluffing out everywhere. That sucked so I'm worried about using a down jacket now.
I only see a couple options, 1) use synthetic insulation so when rips happen insulation won't fly away like a bird (case in point, the Atom LT I have has plenty of rips but no loss of insulation), 2) use heavyweight gear :(

