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 Hydration Bladders - We Are Explorers
How to clean water bottles, flasks and bladders â Salomon Australia
Best Collapsible Water Bottles for 2022 - Soft Water Bottles for Running
Bagstra - The improved design Salomon soft flask manufactured by Hydrapak are flexible. You can compress the bottle as you drink to eliminate water bouncing/sloshing inside and reduce sucking effort. Easy to