Run Hacks: How to keep hydration bladders and soft flasks mould free - YouTube
Soft Flasks - Can you boil them? - YouTube
I feel silly for only just realising, but the whole cap from the Salomon soft flasks comes apart allowing you to give them a good clean : r/ultrarunning
How to clean water bottles, flasks and bladders | Salomon
How to clean water bottles, flasks and bladders – Salomon Australia