This is my first post on the forum so thank you in advance.
I am currently using a kelty coyote that weighs in around 5 lbs. I like making my own gear and the time has come to replace my pack, so I figured I would give the G4 pattern a shot. Ive never made a pack so I am trying to get as much info before I order everything and sit down to start sewing.

the first question would be: does anyone have any experience with this? what are your thoughts, opinions, and tips?

Second question is: I am thinking about making it out of spinnaker material. again what are your thoughts, opinions, and tips?

Thanks!