@Rantaro Here is the most effective way of discretely disposing onaholes:
1. Cut the onahole into small pieces with a sharp scissor.
2. Dispose the onahole pieces into your trash can.
Tip: You can place the pieces into a small bag before placing it inside your trash can to be more discrete.

@Rantaro I always cut them into small chunks and throw it into the trash. Sometimes I'll keep the box but when I don't I just shred it.

@Rantaro I generally cut them into chunks, or at least wrap them up securely so nobody can tell what it is. For the boxes I do the same.

@Rantaro I prefer cutting them as @Onaholder says. Always cut open the interior so nobody has a clue what the pieces are. This works with the package as well.

@Rantaro Where do you all live? Do people routinely go through your garbage? How about put it in a sack and put it in your neighbor's trash? Or the trash can at the nearest gas station. Maybe put it on the end of a stick, wrap it in cloth, and use it as a torch. Or if you are worried that people might be going through your garbage, put sex toys on top. After that, they will leave your garbage alone.