I would look at trail mix bars/gorp bars. Trail mix is trail mix for a reason. Doesn't go bad, has some sugar and some protein and doesn't crush (well it does but it doesn't matter, so you tip the bag in your mouth rather than eat it like a bar). Whatever you decide on, carefully evaluate the protein/sugar/fiber content. Having your glucose level spike quickly then drop is not optimum in most situations. I always mix in oats, and recommend you do the same. Most recipes are a little too fast carb for me, and the oats help balance it.

Marc