That's a double-ended stuff sack. A little different than a Black Bishop Bag. (Black Bishop deserves credit for his contribution, IMO)
This is the piece of equipment on the triangles that breaks the water flow. You don't need anything else, like a drip line.
Like others have said, there isn't enough "wet" on the amsteel lines to worry about. You may have more humidity on your WBRR and clothing than on the lines.
Practice setting up in rain(or equivalent) at home and you'll be good to go in the woods. Congrats on your new arrival.
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