I'm making my own pack and wanted some input on the ideas I have for it. A big part of my choice in materials is price and availability, I'm a poor college student.

I bought a frame from an army surplus store along with some open face belt buckles, and I'm using nylon webbing for all the straps. I had seen an old post on here about padding... I got the idea to use my clothes for the padding (t-shirts for kidney pad, socks and underwear for shoulder straps, sweatshirt and pants for back). All the pockets for the "padding" will have liners made from ironing plastic shopping bags together making them water proof. The main problem I have right now is deciding how large to make the main pocket on the bag, it doesn't need to hold clothes after all.

Any other ideas will be much appreciated.