Thanks to my mom's sewing abilities, we completed my frame bag and gas tank yesterday in about 8 hours.  The small bag was sure tough due to it's size.  All in all, I'm pretty happy with how they both turned out.  Thanks to all the folks who posted their experiences and materials list...helped a bunch!

Really nice job on your bag...going to be doing one myself.  I notice you doubled up using some red ripstop nylon...just along the down and seat tube?  I assume that was to prevent things from wearing through?  Did you put anything in between the two layers?  (I've seen some folks add some foam).