Its a tough call with this one cuz, depending on how "anti-pot" your parents are, they will probably find your shit no matter how hard you try to hide it. I would suggest you try to find an airtight container, like a piece of tupperware or mason jar. I wouldnt reccomend a sock because eventually the smell of the pipe permeates the bag its in and the sock starts to smell just like the bowl.

Also maybe consider hiding your stash somewhere outside your room, where no one would look.