I was recently in Wal-Mart and the little woman made me push the cart so I wouldn't wander off to sporting goods or pharmacy where I look for ration bars. While there I noticed a lot of foods tat would seem good for packs. Soft jars of peanut butter, retort packs of rice in multiple flavors, retort beans, and even retort packets of tuna salad. I filled up the baby seat with things to upgrade my bag, including snacks.