First off......your LT's opinion counts for little. Nothing against him, or other LT's..........but they still smell like CIF. Back with the old sleeping bag (mummy bag), there was an issue with the zippers getting stuck. When this happens, the only way to unstick it (other than calling for help)was to use a knife or leatherman to pry the cloth out of the zipper to get out. This usually only happened when your bag was fully zipped, leaving only a small hole fitting your face or 1 arm. Lesson learned after it happened once...keep a small pocket knife or leatherman inside yoru bag, or close enough to grab when reaching out your face hole.