"So you do not like Spectra cord or the cord and rock sack used in the video from Mountain Laurel Designs. What do you recommend then for hanging food/packs?"
Ryan undobtedly has his own favorites. I avoid ultra fine lines for bear baging. Spectra is good cord, strong and light. But, it is generally way beyond what is actually needed. Stakes pull loose before the line breaks and flinging the stake to all corners, or, if solidly anchored, the tarp can rip. As Ryan mentions, light lines saw into trees when hauling up more than 4-5 pounds, often wedging/sticking into the bark making the bag difficult to pull up. If you cut into the bark further, the tree can exude sap, glueing the line into place come morning. I have had trouble getting a 5 pound bag down! I prefer a dyneema line that will flatten slightly when you pull up a 15 pound bear bag. It tends to flatten over a branch increasing the surface area a bit. I use a heavier 3mm line, 40' or so. Stretch is usually minimal. The line itself is fairly stiff. This handles better in the scrub normally found in forest floors. Limp line, like paracord, has a way of finding all the snags. I purchased about 200' of 3mm "whip" line 10-12 years ago. I am still using it today.