When I venture off on a fishing trip , after one bad experience in Nassau , I have taken to using PVC in the 4 in size. One end has a glued on cap the other is a screw -n cap with a hole on the middle and 2 opposing holes in the tube. Use heavy-duty plastic wire ties to slow down anyone who wants to open it up, a bit of duct tape slows them down even more. PAINT the tube bright RED - great visibility not to mention all pipes painted in this color is for hazardous waste. My Penn Int.'s are packed in the carry on with a meager amount of clothes & tackle. Good luck & throw them back.
--<* (( >< DeLux