Hmmm, the bag needs to dry quickly and be transparent. Perhapse a woven flourocarbon? Maybe the same material as the shroud of turin?
I have never really had a problem with rods (except for once a month afr Sept.11). My micro-leather man that slipped into a cranny in my vest on the otherhand....then there was the serrated spatula that I carried on for my wife. Looked like a cerimonial beheading instrument. That got their attention...and didn't get on the plane.
One cast can change your day...maybe your life.