Carolyn -- if you don't care too much about looks, you can get a canvas duffel bag at the surplus store. They're harder to kill than cordura, although some of the newer bags are pretty bombproof. Also, you get better value if you stay away from the higher end labels: North Face, etc. Outdoor Products sells some big duffels for good money.
On clothes, bring wool and a shell that won't weight 10 lb when wet. You can pick up secondhand boots for reasonable prices in Seattle at Second Ascent.