Water bottles and Oxydation
I often hiked with a Sigg one litre water bottle and it has served me well. It has been with me for rock climbing, via ferrata, hiking and more. I like it because it is light, easy to use and maintain. I liked the one litre version enough to get a smaller 600ml version for conferences and work.
Recently I noticed that the mouth of both bottles seems slightly discouloured. I don’t know whether they’re chipped or whether it’s oxydation from sitting around for so many months during the pandemic.