I just use a jacket pocket or my backpack. Only issue I would have is in the summer when a jacket is (or damn well SHOULD be) impractical. Luckily (!) the summers since I was diagnosed have been shite, and jackets are acceptable!
I’d love a little kitbag, but for the moment they are WAY outta my price range. I do keep my glucose meter in its little zip up case. Use my squishy lantus bag/case thing for spare needles on trips. And my Novopen case handles a spare vial if I think I’ll run out. haven’t really done any long trips since diagnosis, so that method has been fine so far.
Definitely envy women and their handbags – would make life so much easier! Don’t think I could handle a manbag myself :S