Crackers are a great vehicle for other things you may have on hand, such as nut butter or cheese. Whole grains will be more satiating. It can always be taken by spoons, in Pb&js, in cookies or with apples. A great source of energy, peanut butter is packed with healthy fats and proteins.
Unless otherwise indicated on the bottle, it does not need to be refrigerated after opening. Choose multigrain cereals that are individually packaged so they don't become rancid after opening. These foods can be found in the canned food section of the supermarket, but dry products, such as dried meats and fruits, are commonly found in baked goods, such as cookies, cereals and granola, which are also stable.