thought long about this one. but i don't have a BOB or any "surviaval" type gear setups yet. I am a tinkerer type so if I did any type of pack there would be wtuff in it based on the idea of creating gadgets that give me some type of advatage. I guess like a McGyver type thing...
anyways... I would probably glue a strong enough magnet to the center or bottom of the dip can and use it to hold an assortment of screws, eyebolts, ubolts, pins, needles, razors (pieces), and other small bits of metal. stuff I could use for traps, trips, securing things, and making small devices.
never know but an eyebolt and some paracord might keep the zombies from coming in the room and eating your brains while you sleep.