zomg! More snow? There's been more snow this year than any other year I can remember. Or maybe it's this thread... it reminds me that it's snowed so many times already.
It's not just backpacks that are bothersome. Girls with those giant Lululemon/TNA bags who swing them around without consideration for those around them are just as annoying.
As for people not moving to the back... taking off your backpack is often not enough. It's the people who won't move. Even if there's room, people won't squeeze in until someone yells at them to move.