Is there room for Almond butter (all natural no salt) or cashew butter? If he likes
the nuts he will LOVE the peanut butter like consistensy and the taste is out of this world! You could include some crackers
as well to go along with that. If you buy separates on raisins, nuts, pineapple pieces (dried) cranberries (also dried) so he can create his own trail mix. You can get little containers with opening spouts to put them in so he can pick his favorite mix of the day! (also a day container for his daily pick) Some people like chocolate bits which are also made without sugar.
Another idea for his daily pick is to make a snack sack just for his special container. Simple cotton fabric rectangle then sew all but the opening end, then with needle create the drawstring. You may like to make that in the Flag design fabric which is already part of your ottoman design.
I am wondering what you will wind up doing!! I would love to hear!