I recommend the tortilla idea that several others have advocated with fillers. My I hiked the Long Trail, I filled tortillas with PB, cheese or powdered hummus mix for the most part. The key to making it work is variety. I found some cool flavored peanut butters in the store (ex: cinnamon swirl) and I added things like raisins/craisins to the PB and sun-dried tomatoes and olive oil to the hummus to make it taste better. Heck, you can even get flavored tortillas!