After picking up the back-pack from my killed buddy in MP, it was not located to my character correctly, and backpack appeared to be still present on the dead body where it would flicker on\off.

Also after walking\running around for about 10min it would still be strangely attached. Backpack was not fixed in the shown location (screenshot) would however flicker between the correct position and with the shown offset in the screenie.

Unfortunately i didn't had a vehicle available to test if it would reseat after getting in\out of a car or helicopter.
{F18560}