I bought a couple of pieces while out at school and did not feel like parting with them for the summer. All you have to do is clean them completely; nor resin, smell, whatever would give it away that it was used for weed. As long as you do that then it is completely legal to have in a bag. I have carried 2 pipes 2 times on airplanes and never got questioned. Its the same rule that head shops use "as long as its for tobacco usage then you can sell it." Hopefully that helps man:thumbsup: