I usually keep a ziploc bag of plain almonds in my backpack for convenient snacking. 

1 Oz. of Almonds (24 Kernals, ~A Handful):

161 Calories

14g Total Fat

6g Carbs

6g Protein

*Don’t be scared of the “Fat”. The Fat consists of essential Amino Acids and Omega 3’s which are healthy for you (brain food :D)! Don’t worry about eating them too much, but the key is moderation.