Your list is looking very good. The two things you could replace to make BIG differences would be to get a good quality down sleeping bag which would cut it down to about 1lb 8oz and saving you about 20oz (1lb 4oz) and either get a lighter filter such as the Katadyn Hiker (which is 13oz for my set) or go chemical and save almost another pound. Also did you really need a Nalgene and Two Platypus? I would forego either the Nalgene or one of the Platypuses