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