"Nathan® QuickStart 3.0 4L with 1.5L Bladder: The Nathan® QuickStart 3.0 4L with 1.5L Bladder is a unisex hydration pack built for trail running, hiking, and any adventure where staying hydrated matters. The included 1.5L QuickStart bladder sits close to your back, keeping the load centered and balanced across longer efforts. Tiered flask pockets keep your hydration within easy reach, while a zippered power mesh pocket secures your phone, gels, or other essentials without worrying about them bouncing around mid-run. Reflective design adds visibility during low-light runs, and an elastic pole keeper accommodates trekking poles when terrain demands them.The updated push-pull bite valve on the 1.5L bladder is straightforward to drink from on the move and easier to clean after a long day out. With 4L of total storage capacity, the pack handles everything from short trail runs to extended backcountry outings. The combination of dedicated flask pockets and the zippered mesh pocket means your gear stays sorted rather than shifting around, so you can focus on the run instead of managing your pack.Why Our Fit Experts Love It""I took the Nathan® QuickStart 3.0 4L out on a two-hour trail run and appreciated how easy it was to sip from the bite valve without slowing down. The flask pockets kept my gels right where I needed them, and cleanup afterward took almost no time at all."" - Sawyer, Road Runner Sports Fit Expert, Wilmette ILWho It's Best ForThe Nathan® QuickStart 3.0 4L with 1.5L Bladder is best for trail runners, hikers, and outdoor athletes who need hands-free hydration and organized gear storage on runs or outings lasting one hour or more. It works well for anyone who wants a single pack that handles both hydration and essentials carry across trail running and hiking. VIP Family members can take the QuickStart 3.0 4L with 1.5L Bladder for a 90-Day test drive with our Perfect Fit Guarantee."