Traditional wood carriers take more materials and also do not take advantage of the cinching mechanism. This works a bit like a dog "choke chain." If you pull hard on one of those collars they slide to a tighter position. The same thing will apply here. The heavier the load of wood, the tighter the rope will bind.
NOTE: For ease of illustration, the drawing has some significant visual exaggerations.
The pipe in the hand is the same dimension as the pipe down below near the wood cinch.
It's just easier to see the parts with the extremes presented this way...
Step 1: What you need.
2 feet of PVC
12 feet of rope
Sandpaper to smooth sharp PVC edges.
Lighter to melt end of vinyl rope (if appropriate)