if im going out in public for a day or through airport security i hide mine inside of hearing aides(not the tiny invisible ones). They are in plain site and they dont make me remove them. Each hearing aide holds one decent size bowl.
If im going out in public for the day I hide my joints in empty ink pens. The bigger around pens not those puny Bic pens.
A disposable camera works too. Take the stuff out of it and replace it with a baggie. you can even fit a few papers in with it. just keep the camera in your pocket.
Most days i just walk around with a bag in my pocket. it gets a little squished but it smokes the same.
When im stoned around people that arent cool with it I tell them i took an allergy pill. It explains my screwy behavior and reddened eyes. i dont really have allergies.