Salomon Soft Flask, 490 ml with filter - Trekkers Outdoor Ltd.
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
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