If you want sensors, flexible solar cells and/or LEDs all over your bag, you would have to add many grains of sand-sized things, and still need a flexible subst

If you want sensors, flexible solar cells and/or LEDs all over your bag, you would have to add many grains of sand-sized things, and still need a flexible substrate to connect them. (And no, we aren’t there by a wide margin, but I think something like that is part of the vision)