Military officers in the 18th century usually did not have any cases or boxes. Normal soldiers for example often had cartridge boxes.
I usually hear, that officers had servants/etc to take care of carrying stuff around. This generally makes a lot of sense in the context. For example, officers usually were noble. And the nobility was used to letting servants take care of things.
But I still wonder, if officers never had the need or desire to take some things with them personally and not give them to a servant. For example on a journey (maybe alone), in the field, or on a construction place. Those things could range from a bulk of highly important papers/maps to maybe personal stuff, that they would not want to give out of their hands. I mean carry directly with themselves. Very small amounts could be put in the pockets of the coat, of course. But what about a bulk of maps, or some very costly small instruments?
IF this desire/need existed, the obvious question is: Where did they put it? There were surely some good options to choose from.
Summary of questions:
- Did officers ever had the desire/need to carry around some amount of things/papers/instruments/etc directly attached to the person?
- If so, what did they use for this?
If the answer to (1) is "definitely no", please try to include some convincing points. For example, that there were always superior options to choose from.
For (2) a small selection of typical options with a small reference would be great. Nobody expects a complete list. If you have some personal favorite, include it, of course.
Background: I have seen some very few (modern) drawings of 18th century officer uniforms with cartridge boxes. But the text for those drawings did not indicate any details.