It's hard when you're being generic - bathing clothes/towel could weigh 5 lbs or less than 1, depending on what they're made of. Mess kit could be a pot and cup, or a complete kit of nonstick cookware with spatula, BBQ fork, and two burner kerosene stove.

Also hard for those of us unfamiliar with the area - what are the temps where you're going at this time of year? Are you taking enough clothes, or too many?