This is a lightweight silicone bottle. I used it on a trip once or twice, but I don't use it much anymore, so I'm selling it. It's not airtight, so you can't put water in it and put it in a backpack, but it's suitable for boiling water and freezing, which was convenient. There are no stains or dirt, but I am a private seller, so there may be oversights. Please understand this and purchase. I will pack it using recycled materials from my home. [From the official website] This silicone bottle can be used in a temperature range of -50°C to 200°C. When folded, it fits in the palm of your hand, making it convenient for storage and carrying. It is very lightweight, so you won't feel burdened during outdoor activities such as long hikes and camping. Retail price on Rakuten: 3190 yen