The mission: You're gonna march 100 miles in four days. You have the requisite equipment packed in your ruck ( backpack ), and you have space for one Pogey Bait item. I'm not sure where the term originated, but Pogey Bait is essentially whatever junk food you choose to carry. For our purposes, you have the space equal to half a loaf of bread, and trust me, that's generous. Whatcha eatin', maggots?