I'd put a small bag of De-germinated Corn meal,small can of Crisco,& a few small cans of cooked Turnip Greens in place of those Mainstay Packs.Why?#1 The above weighs about the same as 2-3600 paks#2 Though the above is not as "Caloric" as, the Mainstay bars are,Fried Cornbread & Good greens w/ Pot Liquor will make anyone Smile Before,During,& After eating it!I have Never observed Even the closest inkling to a Slight Grin from,Anyone,After Attemping to Consume Just a few bites of a Mainstay bar!MRE's are very good also,I lived for 8 Months+ on Just MRE's in the Middle East,& Never Contracted the "Hershey Squirts" for that duration!To each his own for sure,but those Mainstay paks were meant for the Open Sea originally,whether onboard or Overboard,lol!& Cornbread will catch fish,Also!:)