I bought this for hiking and light mountain climbing, but I stopped using it after having a baby, so it's been stored unused. <From the HP> Can be attached to various sizes of our water carriers and also to plastic bottles. Easy to create a hydration system. With a stopper to prevent unnecessary water flow. For both water carriers and plastic bottles. Can be sterilized by boiling (excluding the clip). Outer tube size: 750mm Inner tube size: 340mm Material: PP (cap) Elastomer (tube) PC (clip) With stopper Made in Japan Simple packaging, as-is delivery. Please understand that this is an unused item that has been stored at home before purchasing. Please refrain from purchasing if you are sensitive to such things. m(_ _)m Evernew Mountaineering Trekking Mountain climbing