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Just keep in mind there's not a lot of room in Hall H itself so whatever you bring with you should be small enough to fit in front of you/on your lap or you should plan on bringing it back to your car/hotel before going into the room. If that's not a problem, heck yeah bring a sleeping back. I just bring a sleep sack (like a sleeping back, but about as thing as a sheet), and a sweater and I'm fine. The hard ground does suck though.
WRT poster/document tubes, I'm a big fan of this one:You are not allowed to view links. Register or Login
Here's a tip. If you want to save money, and you're not too picky, you can get free Hall H camping gear on the Hall H lawn, about 30 minutes after the line is let in. Seriously, it's amazing how many people dump their camping gear on the lawn because once the night is over they don't want it. I've seen folding chairs, air mattresses, sleeping bags, blankets, pillows... these people need to be assessed with a fine for littering.
Yeah, if they set up a bin in a convenient location, I'm sure a lot of people would take the time to drop it off. That would be a wonderful way to go.