Coconut Oil is used to hold the bars together. As coconut oil softens at room temperature, these bars need to be kept refrigerated or frozen to hold their shape. They will start to fall apart at room temperature, so are best eaten straight from the fridge or freezer. For a firmer bar, butter can be used instead. If you do want to add them to lunchboxes, I recommend making them in paper cases rather than cutting into bars, and use an ice pack to keep them cool!