I have recently been hunting for a external backup battery for my iPad. So last weekend i went to the mall and take a look at the Powerback from Kensington. It's a cool unit. However, I found that it really adds some weight to the iPad, not to mention that iPad is already quite weighty. Also, Powerback's kickstand doesn't rest well on my lap when I put into typing angle mode. On top of all that, the screen and the bezel of the iPad is completely exposed, It bothers me if I put into my bag pack where god knows what really happens in there when i am on the move. For all the iPad users out there, please help me find the perfect backup battery case, Thanks very much !!