During the years I have experimented with lots of containers for daily use (flasks, glass vials, plastic snuffboxes, pill boxes, etc) in the end I’ve settled with carrying 3 containers with me inside a old RYO ziploc bag:

1- One Toque 10 g  screw top tin for pinching, it seals very well and never opens by accident.

2- One metal bullet, for fine dry snuffs, I do not use it directly to my nose, I pour a dose in the back of my hand and pinch from there.

3- One Poschl container, easy to use, seals moderately well and can be shown with confidence in airports if suspicious looks arise in places like airports and the like…

So wherever I go I can easily take 3 different snuffs with me for different situations, the only downside is that it’s a bit bulky but still fits in my pocket.