We have been using Tailwind now for 12 years and it is the answer to your endurance fuel needs:
Complete calories, electrolytes, and hydration: Ditch the gels, chews, and pills, and go all day with just Tailwind.
No gut bombs: Stomach problems? You’ll love Tailwind. 
Tasty all day: Clean, light flavours taste better the longer you go.
Hydration pack love: Dissolves on contact and cleans up with a quick rinse. No film, aftertaste or science experiments!
All natural: Crystal clear with no dyes, preservatives or 4-syllable magical ingredients.
 
50 Serve Bag=25Hrs Fuel(200 Cal/hr)