While there is no real "better", there is always what is best for a certain individuals needs according to individual experience and anticipated circumstances.
I keep it in a zip lock bag. Though, the hunt for the perfect container is always on. I think that non-collapsible containers constantly beg to be filled with more stuff, which leads inevitably to the search for a larger container, leading to compromises, crutchery, etc. That's why I like a ziplock bag. I decide what goes in it, and it shrinks to the size I need. No temptation, no indulgence.