I would think that stuffing a person into a duffel bag would also be illegal if the person did not consent to being stuffed in a duffel bag.
In fact, it seems odd that a dead person cannot be placed in a duffel bag. It seems like a reasonable way to carry a dead body to where you need to get to.
I'll have to remember this if I am ever in the wilderness with a duffel bag and someone in our party dies -- no stuffing the dead body into the duffel bag.
Next time he should use a large trunk, like normal people.
That's only OK with carrion luggage ....