Designed for use with our Flow Gel, the Flow Bottle and Flow Flasks make it easy to track your carb intake and hit your numbers. Both the Flow Bottle 300 and Flow Flask 300 can both hold a full pouch of Flow Gel. That's 300g of carb in one bottle/flask! The Flow Flask 120 (which holds 120g of carb) is designed for shorter events and training sessions. We tested every bottle and flask we could get our hands on to find those with the best flow. Flow Bottle 300 Weighs only 51 grams, making it one of the lightest bottles out there. That's good for performance as well as reducing the CO2 emissions required to produce the bottle Graduated scale from 60 - 300 grams of carb (in 60g increments), so you can easily track your carb intake A soft body that's easy to squeeze for maximum flow Flow Flask 300 Weighs only 29 grams! Fast-flow bite valve that's easy on your teeth Graduated scale from 60 - 300 grams of carb (in 60g increments), so you can easily track your carb intake Shrinks while you drink to eliminate 'sloshing' Fill marks so you can easily mix up drinks to your needs BPA/PVC free, will not taint taste Can be compressed down for easy storage Flow Flask 120 Weighs only 25 grams! Fast-flow bite valve that's easy on your teeth Graduated scale from 30 - 120 grams of carb, so you can easily track your carb intake Shrinks while you drink to eliminate 'sloshing' Fill marks so you can easily mix up drinks to your needs BPA/PVC free, will not taint taste Can be compressed down for easy storage Flow Bottle 300 Capacity: 500ml (16oz) Closure: Wide, flat, push-pull nozzle Material: BPA/PVC Free TPU Bottle Dimensions (approx): L 160mm (190mm with Nozzle), W 74mm, D 74mm Flow Flask 300 Capacity: 500ml (16oz) Closure: Regular Bite Valve Screw-In Lid Material: BPA/PVC Free TPU Bottle Dimensions (approx): L 200mm (245mm with Nozzle), W 90mm, D 30mm Flow Flask 120 Capacity: 200ml (7oz) Closure: Regular Bite Valve Screw-In Lid Material: BPA/PVC Free TPU Bottle Dimensions (approx): L 145mm (190mm with Nozzle), W 72mm, D 30mm