Check out this web site.

http://www.backpackinglight.com/cgi-bin/backpackinglight/index.html

There is a forum and pack lists. Some folks are doing overnights
with 4 lb pack weights (sans food and water) and not leaving a lot
of stuff behind.

Pepsi can alcohol stoves that weigh 1 oz.
Daypacks 3 oz.
shelters 6 oz.
etc.