Concerning the Brunton lighter.
I have never had much luck with butane lighters about 5-7000ft.
I do l;ike the idea of a totally sealed cap, the lack of a lanyard for both the cap and body needs to be addressed.
IMO having a lighter body like this new model would be great but why not make it a conventional liquid fuel lighter? With a totally sealed body evaporation of the fuel would not be an issue.<><