I've never tried making any of my own gear before, but it sounds fun, and a lot cheaper so I would like to give it a try. I've decided to start by trying to make a few stuff sacks, because they seem pretty easy to make and the ones I do have are pretty worn out at this point.

I'm not sure what the best way to go about making a stuff sack would be, either to sow on a round bottom or just sew the fabric together at the bottom so the sack tappers to nothing at the bottom, any suggestions?
Also does anyone have any advice or tricks to working with this material? What type of sealant would work best?