the best way to learn is to get out there an do. I've got a pile of gear in the basement from that. 3 backpacks from external frame down to 2lb lightweight bag. multiple sleeping bags that have gone from over 4lbs to 19oz. that all takes time. do some hikes, figure out what works. if you don't use it, don't take it. oh and watch out for "stupid light" ie, not taking something you need to save weight!

john