17 kg for 30 person-days comes to 0.57 kg per day per person. Not gonna worry about the weight of a folding aluminum pot and some fuel tablets for the moment.
35 kg for 30 person-days (I presume that's still how many days the 4th Edition gives) is 1.17 kg per day per person.
- Freeze-dried LRP rations of the 1960s-1980s era weigh an average of 0.35 kg each, and are each 1100 to 1500 food calories; you were expected to eat two a day (thus 0.7 kg per day).
- Modern (after the 1990s anyway) dehydrated LRP rations are each a complete day's meal, but weigh about 0.5 kg each.
http://asmrb.pbworks.com/w/page/5275...ear#RationPack- If you go to MREs, which aren't dehydrated, each meal weighs .51 to .74 kg, and you should eat two a day: about 1 to 1.5 kg per day. An average of 1.17 could be easily correct.
It sounds like they weighed a few MREs and are using that value for the 4th Edition (without changing the text to, ahem, hydrate the food); or, it could be modern LRP rations, plus that canned fruit juice ... or, something else.