I would like to design a backpack that has lots and lots of pockets.

Big pockets, small pockets, medium pockets. All sorts of pockets!

I would call it ‘The Van Helsing‘, and I would use it to store wooden stakes, and hammers, and bottles of Holy Water, and cloves of garlic, and an Almanac that shows the exact time of sunrise for every day, and crucifixes, and silver bullets. And then, because it would weigh about 15kg with all this stuff in it, I would beat vampires to death with it.

So it will need to be sturdy and stain-resistant as well.