Hey, does anybody know of a kind of tubing that is as flexible or more flexible than latex?  I find that after only a few days inside a packer, the latex begins to expand, which causes some problems.  I'm a boxers kind of guy, so maintaining a natural hang is important to me.  Any ideas?

there is no tubing more flexible then latex i suggest trying to find  a tube with thinner walls. the thinner the walls the more flexible.