Tied webbing on a tree - skip the overhand knot
If you're tying webbing around a tree to make a rappel anchor as shown below, keep it simple: tie a single loop to make the anchor.
For some reason, lots of people want to tie an overhand knot near the masterpoint, as shown on the right.
This does nothing to increase the security, strength, or redundancy of the anchor. It uses up more material, and makes your anchor slightly weaker, so there's no reason to do it at all.
