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The development of the FSR came from the fact that prior to deployment, soldiers would "field strip" their MREs. Field stripping involves removing all the excess MRE packaging and unwanted items - bags, boxes, heaters, extra spoons, accessory packs, etc. Creative field stripping could reduce 3 MREs - one day's worth - down to the same size as a single MRE. While this practice reduced the soldier's load by only packing the most critical MRE parts, it also led to increased waste and a reduced consumption of food. A single FSR, which is 24 hours worth of food, is approximately 50% the size and weight of three MREs.
1 FSR = 2,900 calories
3 MREs = 3,800 calories