Our group has been vacuum sealing oatmeal for a couple of years. Works great. We simply measure out the appropriate amount for a breakfast and add our additions. Each bag gets some brown sugar and cinnamon.  Then each bag gets a dried fruit. We have used raspberries, strawberries, and apples to name a few.

When we first started doing our own food packing the oatmeal, instant mashed potatoes would go in a plastic container of some sort. Which was fine but then we lugged around the useless empty containers the rest of the trip. Now we bring out more garbage but it allows us to lose one of our food packs much more quickly.