Bed headboard book/toy holder?

I was wondering if anyone had any ideas of what I could use to put onto my DS's bed railing/headboard to hold random books and toys he collects but doesn't want to put away at night. Something that would hang over the headboard/footboard and ideally fabric with some structure would be great. Sort of like those chair back book holders you see in classrooms or some sort of tote but with a hook or something to hang over the board. I've looked around, but cannot seem to find anything that would work. Thank you in advance for any ideas!