After I did the DAFNE course the amount of kit I carry went up .. a lot! To the point where I got a case from one of the diabetic companies.
I like it but it’s large, certainly a lot larger than @tim two pencil cases, though I’m not really comparing apples with apples since their pumpers case is larger than the mdi one I’m currently using.
The downside of kitbags is when you forget one thing you forget everything!