Im trying to figure out what I should load up on before a long hike. In the army we always had to down a 1L of water and eat a good heavy meal before a long march.

At the same time I was wondering if doing a Protein Shake right before heading out would be a good idea. I have a huge tub of GNC amplified Mass XXX sitting around that is packed with good stuff

One serving has 900 calories, 124g Carbs, 50g Protein, and 110% of need Calcium when taken with 2% milk. I figure i could take one with me and drink it in the car before heading out.

Thoughts?