This tiny little bong from shivaheadshop.co.uk will fit perfectly in your pocket. The travel bong has a whole in the center through which you insert your... finger. That's right you stick your finger in there and you can enjoy a nice bite sized hit anywhere you go.
I wouldn't recommend that you take this with on the plane. Everyone who has seen Escape from Guantanamo Bay knows why. On the other hand this seems like the perfect little tool for train trips, and the next time I head into LA via the metrolink I'm going to be plenty baked.
This also seems good for anyone who wants to go boatin' and tokin'. However, if you should find yourself using a travel bong while boating, while in traffic stopped at traffic lights, you may have a problem. Addiction treatment and information is available