I don't know about iPads over heating, mine lives full time in a case which encloses all of it except the screen and the control buttons.... No problem.
I put the iPad still in its case on the book bag. No problem.
My I Pad tells you when it is to hot,it comes up on the screen ,but never has it done it while in the beanbag,so when it tells me it is to hot I just float it in a sink of cold water, only jocking about the water.
I think the ipad would be fine in the bean bag compared to a pillow or quilt because the polystyrene beans have a very different thermal rating surely. Laptops rely on cooling fans so would smother.
Those cases weren't necessarily from the device overheating, but rather the charging device being faulty. As previously stated, because the Ipad doesn't rely on air forced by a fan through vents for cooling, it is unlikely that putting your Ipad in a "bean Bag" will have any detrimental effect.
-- Edited by 03_troopy on Tuesday 14th of January 2014 06:42:49 PM