When players are sitting in a car their backpack no longer clips through, but I've seen water bottles FROM the backpack floating in mid air as if they weren't removed.
Thanks for bringing this to our attention. Can you please upload your DxDiag here, and give us some details regarding your video settings? I'll pass them along on to the team.
There you go, sorry about the wait. Just saw your reply.
@Demotic Thanks for the info!