Ideal for endurance athletes, the soft-sided, collapsible Hydrapak SoftFlask SF150 conveniently dispenses gels (sold separately) during high aerobic activities. Measuring 6.5” x 2.8” when full, the bottle stows 5.1 ounces of gel and stashes easily in packs, vests, PFDs, or lumbar belts. The SoftFlask SF150 gel flask is equipped with a 28 mm-wide screw cap and a silicone bite valve. The lightweight but sturdy TPU construction of the flask is both BPA and PVC-free. A pinch welded bottom bolsters durability.