Once we dropped out of the very chill winds atop Bear Mtn, NY, I shed my outer layer...a poly puffy...and trapped it under the brain of my daypack. When we reached the next ridgeline after a scramble or two, the wind picked up again. I stopped and turned to Lu to tell her I'd have to layer up again, discovering she'd been carrying my coat for a while when it fell from my pack. That would have been a quite uncomfortable lesson learned! Next time I put it fully in the pack and closed it up tight.