I haven't seen a whole lot of pictures from this most recent incidents, but from the ones I've seen - many backpacks, large purses, and no shortage of roll-a-board luggage.
I was actually going to start another thread on this but this may do fine.
Now - in a situation where the crew has time to explain that these things are to be left behind, this would be pretty bad. But in this case I could see the amount of time between impact, stopping and finally coming to rest may have been just a handful of seconds.