No it doesn't. Opacity
is a measure of an objects penetrability by radiation. Does not have to be light, but can be. And an opaque object DOES NOT have to be totally impenetrable.
Describing an object as opaque is simply saying the object is not transparent. The OP would need to define exactly how opaque the bag is if he wanted to say it as totally impenetrable by light. Or use a more accurate word to describe the object.
This is why bathroom glass is called opaque when light can clearly pass through it, and why so many people go through life thinking opaque means partially see-thru.
https://www.google.com/search?q=opaq...=1920&bih=1009
That said, why wouldn't you pay $100 for a bet with a probability of winning worth $150?