Along the lines of the standard 3 gr one of sturdy glass, but:
1- The cap is a flat-topped piece of glass (like this: http://agaraura.com/kingkohkong.html without the ugly top part) rubber cushioning underneath
2- The rubber cushioning is attached to a plastic applicator stick thay fits into the bottle.
Thus, no need for an extra screw-on cap (bleh), and if the bottle drops only the glass top bit shatters, can simply be replaced by a new cap.
1- The cap is a flat-topped piece of glass (like this: http://agaraura.com/kingkohkong.html without the ugly top part) rubber cushioning underneath
2- The rubber cushioning is attached to a plastic applicator stick thay fits into the bottle.
Thus, no need for an extra screw-on cap (bleh), and if the bottle drops only the glass top bit shatters, can simply be replaced by a new cap.