I was looking for some of that stuff a while back. not sure if I
hit frostline before they folded, i can't find book any marks so
they may have been the other one. On possiblity I found was
www.justmakeit.com
haven't followed through yet though, I found 4000 cubic inch
backpacks on Clearance at the coleman outlet. Was bigger and
simpler than I wanted... but at $23 a pack I equipped the church
group, since I could hardly have bought Fanny packs for that
price, yet the tops become one.

Another place for paterns.. not kits would be
http://www.rayjardine.com/projects/projects.shtml
he only offers tent and tarp plans however. Oh and a Cool litle
homemade minilight I might make, and homemade soap for the truly
daring among us.
Hope these links help you
If you find any better sources please let me know.

John