There is no such thing as a baggie that you can open up and take a pinch and close again and expect to be smellproof. Its on your hands and youll put it on everything you touch. (If youre worried about police dogs that is)
If its just mom and pop try the ziplocks that prevent freezer burn. They do the trick with an extra layer. Remember its not so much the smell of the weed in the bag as the smell you put on the outside of it.