I'll often make whole food energy bars to take with me. They pack better than fruit and are made completely from whole food ingredients, unlike most commercial versions. Besides, the folks at the TSA don't mind if you pack these bars in your carry-on, unlike, say, nutrient-dense smoothies. Another bonus to homemade bars: Unlike some commercial options, they don't come in metallic wrappers that can also slow down the security process.

For perfect clean-burning fuel to keep you going strong for hours, try this recipe:

Chocolate Blueberry Energy Bars (from 'Thrive')

Ingredients 
• 1 cup fresh or soaked dried dates 
• 1/4 cup almonds 
• 1/4 cup blueberries 
• 1/4 cup roasted carob powder (or cacao to make 100% raw) 
• 1/4 cup ground flaxseed 
• 1/4 cup hemp protein 
• 1/4 cup unhulled sesame seeds 
• 1 tsp fresh lemon juice 
• 1/2 tsp lemon zest
• Sea salt to taste
• 1/2 cup sprouted or cooked buckwheat (optional) 
• 1/2 cup frozen blueberries

In a food processor, process all of the ingredients together, except the buckwheat and blueberries. Knead the buckwheat and berries into mixture by hand. [Yields: 12 bars; Prep Time: 10 minutes]