Arrange the stack from largest at the bottom to smallest at the top.
Position the bag, with opening upward and within 2 inches of the top of the stack, and anchor the very bottom of it with a heavy object.
The mouse will smell the food, climb the stack, and fall into the bag.
The slippery sides will trap it, and the mouse's movement will produce a loud rustling sound to alert you that the trap is occupied.
Simply take the bag, fold the top over to prevent escape, and release the harmless little guy outside.