[wyattearp]

Bodies were sometimes tied into position, indicating something else: a possible fear of the deceased's return. People had some reason to fear the deceased might come back.

Or, they were just trying to keep the limbs from flopping around while they were stuffing them into the hole.

[SunkenCiv]

The fact that they took the time to treat dead bodies in any way at all shows they had feelings for their deceased loved ones. :') Jug or jar burials continued into early classical times, at least.