I got my #3 zipper in the mail today. It is a little small, but prefect for this project.
When I was ordering I asked the people at OWF what the weight difference from the #3 to the #5 zipper. They weighed it and it was about 1 oz a foot heavier for the #5. That helped me choose the #3. The #5 would have added about 7 oz to my bugnet.
Is that too much to ask? Girls with frikkin' lasers on their heads?
The hanger formly known as "hammock engineer".