Run Hacks: How to keep hydration bladders and soft flasks mould free - YouTube
Budget vs Mid-Range vs Leader: Soft Flasks – All The Running Kit Reviews
Salomon Soft Flask Straw - Hike & Camp
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