I had a VERY hard opening about 5 weeks ago. Didn't fully lose consciousness, but was unresponsive for some unknown amount of time. No serious injuries--very painful stress fracture of the sternum kept me on Vicoden for 3 weeks. Sabre 170, loaded at 1:1. I was playing with a new Audible, so was on my belly, stable, waiting on pull time. I always pack for myself (except this time). It was my 6th jump of the day and was tired, so used a packer at the DZ who is experienced and trusted (I'm not blaming the packer). Being new to the sport, this is my first injury and, frankly, it spooked me. I don't want another opening like that one! I've been told the following: 1. Sabres have a reputation for opening hard on occasion (is this true?) 2. Perhaps it was a simple packing error (if so, what exactly would cause a hard opening) 3. Maybe it was my body position at pull time (but I was on my belly, waiting on pull time) Just trying to figure out what happened and how I can avoid it again... Al