Hi Wayne. I use a suitable size pencil case, which I put in my handbag, Others use their pockets. I have a small plastic box for my sharps etc till I get home .
You'd need to keep
Needles, BG testing gear, your preferred hypo treatment, I use dextrose energy tablets as they don't take up much space, in use insulin I also carry a spare of each insulin .
If you have reusable pens you only need to keep 1cartridge of each as a spare In case of accidents when you're out , plus their is less waste.
At home I alway have , 1 spare pack (it's usually 5 in a pack) of Each insulin plus the pack I'm using in the fridge, this give me breathing space if , something goes wrong with my repeat prescription or the insulin has been compromised and I have to chuck a pack.