What cool features would you most like to see on a backpack?

Please tell me what cool features you would like to see on a backpack and what you would find most useful.





I am in the planning process of a new product and would really appreciate all your ideas.





Thank you|||I would like my backpack to have a zipper that I can open to access the very bottom of the pack. It always seems the one thing I need was the first thing I put in the pack, down at the very bottom. I have to take almost everything out to get to it.