I had an aluminum bottle that resembled that top SIG I used for a year. It was a very pretty purple, and worked well. Except when hot or very cold. I only got a years use out of it b/c the threads at the cap stripped. I imagine the Sig will do the same. The Nalgene I have has a drop-in filter, which is tops. I do miss my white fuel bottle however....so pretty. Regardless, plastic bottles I have used worked better.