Simple, sleek, and ready to flow. The 15 oz Breakaway Muck is a single-wall bottle in a compact package dialed to fit dual-suspension MTB frames. Made for muddy mountain rides and dusty gravel trails, the MuckGuard™ valve cover seals out gunk and grit so the water flows. The Surge valve delivers a solid stream, then self-seals to eliminate drips and spills.