Trader Joe's helped me out with finding the best food to pack for my relay:
(I stood in the trail mix aisle for lots of minutes comparing all the different varieties. I was originally looking at some other varieties with pistachio nuts and craisins.... but who can say no to these little peanut butter cups??)
And, of course, grapes.
A little salty, a little sweet, and things that are easy on the stomach because yikes does it feel nauseating to operate on no sleep.