Generally the hardware used to connect the spreader bars to the hammock can act like a drip line... I've never needed one with a bridge hammock, and I've been in some very heavy downpours. Using a Fronkey style net on a bridge hammock sounds like it'd work, but I've sewn and tried, but it doesn't. Shug's bugnet is a decent idea, but I still much prefer the zippered one I show how to make in next video of the series.