Mainstay 3600
[SI-M3600]

Although they may seem weighty at first, compared to the weight of other food options for the calories, these rock. No preparation needed, just break one of the 9 off and chow. Leaves many crumbs, so testing in the living room may upset the spouse. Doesn't leave a dry feel in the mouth after either.
The 9 bars are not in separate packaging inside, and the package is not resealable that i could tell, I'd recommend packing some zip lock baggies to contain the open package in case of crumbling in bag or precipitation.