There is a hanging option for a hydration bladder here

8 cm handle with skeleton-style belt clip

- Material: 100% nylon (1000 den)

optical-grade polycarbonate / Frame: plastic resistant to chemicals and temperature

Robust construction and well-thought-out features:

Halswärmer Nackenschutz Tube Lite Plytix There is a hanging optionSoft, close fitting neck warmer from Woolpower made from fine merino wool that provides excellent protection from the cold. Thanks to the elastic terry fabric, warmth is stored close to the body, offering incomparable insulating properties. The Tube LITE is shaped like a tube and is long enough to pull up over your mouth and nose or alternatively to wear as a hat. Easy care and washable at 60C. Hinweis: Der Halswrmer kann auch als Mundschutz verwendet