I don't know how well it works with sniffer dogs though. I was at a hotel for an extended work trip. One of my coworkers had a vacation to CA planned right in the middle and he asked if he could leave the baggage he didn't need on vacation in my hotel room so he didn't have to deal with it in the airport.
When he got back, I took his bags to his new room. I said "Don't worry. I didn't go through it. I smoked all your weed though". I was just joking, I didn't even know he smoked weed. He reaches into a bag and pulls out one of these jars full of weed. The moment he opened the jar, I could smell it and it was overpowering! It was really good stuff and I never once caught the faintest whiff of it in the 16 days he was gone.