If there’s a prospect of freezing temperatures, spot your filter in a leak-proof bag and stash it as part of your sleeping bag overnight—if it freezes it can be no longer Protected to use. Read about several of our favourite water filters right here. 必须在特定位置：而另一些物品，例如头盔，鞋子。首先它们的效果是唯一的，你佩戴一个头盔（鞋子）之后，该头盔（鞋子）右面所有的头盔（鞋子）效... https://andrewn124arm2.wikidirective.com/user