Speaking from Experience (see below), there’s nothing like a good exhausting work out trying to get out of a Sleepsack. Much like in the videos below.
Yes, that’s me testing out a Neoprene Sleepsack Prototype 3 years ago. I was told “Go Ahead. Just try to break out of it”. I exhausted myself after 30 minutes… and took a good hour nap in the Sleepsack.
You can see more photos by clicking on the photo.