It should, it was designed to be TSA approved. However, given that the rules can change at any time, you may want to double check with the TSA to make sure.
The manufacturer does not state the dimensions of the Guard Dog Security ProShield Smart Bulletproof Backpack ballistic insert. For the exact specifications I recommend contacting Guard Dog Security.
The Guard Dog Security ProShield Smart Bulletproof Backpack only has armor on the back of the bag. So if unzip both sides will not have armor.
No, that's child abuse. The flat part that rests against your back contains the bulletproof insert. It can be worn normally or against your chest.
Please contact the manufacture for more details on this question.
No it does not appear that this item is waterproof.
Yes that is correct.
No it does not appear that this item accepts a water bladder.
Please contact the manufacturer for more details.
The weight is listed at 4.16lbs according to the manufacturer.