If you want to put your pre-roll filled cone in a tube to keep it safe, go for a glass j-tube. This will help you keep it discreet. These are sold by single or by the case of 570 per case.
The best part about these 120mm clear glass j-tube is they are a newer design. Not only do they look cool but they also provide you with a child proof cap. It is NOT easy to open these up! The cap helps protect it from any smell or air escaping or getting it. You can sure it is also water proof.