One of the most sneaky and discret pipes is the Holie Bowlie metal bracelet that is also a hand pipe. It is a perfectly disguised multi-use items. Not only is it a bracelet but it's also a pipe. It gives a new meaning to hand pipe.
The Holie Bowlie bracelet even has a metal bowl cap which helps you close the top to keep your stash a secret. It also helps keep the residue smell to a minimum.