With bias tape I get 5 layers of fabric with 4 layers cut on the bias which is definitely stronger.
Recently I have been using the polyester bias tape from Quest Outfitters, 3/4" wide. Unfortunately I don't have a binding attachment for bias tape that wide so I have to sew once, then fold the bias tape and sew a second time. But the bias tape still makes everything easier - the first time just line the fabric edge with the middle of the bias tape and sew. Then fold the bias tape in half and sew again. With the binding attachment, the whole operation is accomplished all at once. You only need to sew once. Sometimes I will sew twice anyway to reinforce, spacing the stitch lines on different sides of the bias tape.
How much weight does the bias tape add?
Is that too much to ask? Girls with frikkin' lasers on their heads?
The hanger formly known as "hammock engineer".