My much older Safari has a zipper not velcro to close up the bottom and it works great. It has a single line and some plastic circle rings so all i have to do is pull the same line one way or the other.
Whether trail or paddle don't you know
My hammock is the way to go
There peace and solitude I find
To ease all troubles from my mind
Both body and soul revel in delight
As day surrenders to inky night