Whether you're trail running or trekking through the backcountry, staying hydrated is crucial. This streamlined bottle is designed to fit a wide range of vests, belts, and packs, thanks to its low-profile, pinch-welded base. The single-handed SpeedFill cap flips open for quick refills and snaps shut for a leakproof carry. A high-flow, self-sealing bite valve ensures you get sips, not drips. Its large 42mm opening makes filling with ice or drink mix a breeze, and as you drink, the compressible material shrinks, reducing water movement. Crafted from 100% BPA and PVC-free construction, it's even compatible with 42mm threaded backcountry water filters.