I recently built a backpack system for carrying a camera stabilizer. I have two rods that come up out of the backpack and over the shoulders. Wire is attached to the end of the rods, and the camera is hung from the wires. The rods are run up straight out the backpack, but the weight of the camera bends them over the shoulders into position. The camera is under 15 pounds. I built it with fiberglass rods which worked great, but after a couple of weeks of use, the rods cracked, then broke. Is there a material that would be flexible enough to bend over the shoulders, yet strong enough to hold 15 pounds on a regular basis?