"Salomon® Soft Flask XA Filter 490ml/16oz 42: The Soft Flask XA Filter is a hydration bottle built for ultramarathoners and trail runners tackling remote terrain where natural water sources become your lifeline. With an integrated filter that removes bacteria and protozoa, this bottle lets you drink safely from streams and lakes without carrying multiple liters or treatment tablets. The collapsible design shrinks as you drink, eliminating bounce and sloshing while giving you a clear visual of how much water remains - a practical advantage during extended efforts when every ounce matters.Built from 100% BPA and PVC-free materials and meeting US FDA testing protocols, the bottle prioritizes safety for remote expeditions. The wide 42-mm cap makes filling and cleaning straightforward even in challenging conditions, and it fits most standard hydration pack connectors. Whether you're running a multi-day trail event or exploring backcountry routes, this unisex water bottle removes the logistical burden of pre-filtering water, so you can focus on the run itself rather than water management.Why Our Fit Experts Love It""I used the Soft Flask XA Filter on a weekend trail run through remote terrain where natural water sources were my only option. The filter worked reliably, and the collapsible design kept my pack feeling lighter as I drank through the miles."" - Sullivan, Road Runner Sports Fit Expert, Naperville ILWho It's Best ForThe Soft Flask XA Filter is best for ultramarathon runners, trail runners, and backcountry athletes who need lightweight hydration for extended expeditions and ultra-trail efforts. It works well for anyone running in remote areas where natural water sources are available and carrying pre-filtered water isn't practical. If you value safety, weight savings, and self-sufficiency during long training runs and multi-day events, this unisex hydration bottle delivers the independence you need. VIP Family members can take the Soft Flask XA Filter 490ml/16oz 42 for a 90-Day test drive with our Perfect Fit Guarantee."