I should add that Sustained needs something else added to it - it's really bland on its own. I mixed it with Gu2O powder for electrolytes, sweetness and flavor.

And, can't stress this enough - Sustained and Perpetuem have very limited "shelf" life. Once mixed, you have about 2-3 hours to drink it before it starts to get "skunky." The both are soy-based, but never noticed a strong soy taste from them. However, the flavors might overpower that.

I like the Infinit because I can get electrolytes and protein in amounts I control - less in the winter, more in summer.