from what i understand somthing like coffee beans or ground coffee because dogs sense of smell is so high. It was explaned to me as when we bake lets say brownies we smell brownies but dogs smell egg flower chocolate etc. You can put it in vacume seeled bags but you have to make sure you get the smell off the outside of the bag if you have it sitting on there. I dont know how accurate i am but i would think if your going through the trouble of finding ways to get bud past dogs you would want to be sure a dog cant sniff it out.