I think the common wisdom is that it's not a good idea to perforate the main body of your hammock with needle holes, that it may weaken the fabric there.
I would advise that you sew the pocket to the edges of the hammock, and not just stick a pocket in the middle of the body of the hammock. There are other stitches around the edges, and your weight is better distributed there.
Just my .02.
"Civilization is the limitless multiplication of unnecessary necessities." - Mark Twain
“I go to nature to be soothed and healed, and to have my senses put in order.” - John Burroughs