This is genius. What a great idea! I just need to find something similar that can fit a super-size tampon... Hmmm.
I'm trying to think of stuff for you & others who read, who need something a lil' larger...
If you use the kind with a cardboard applicator, then the only thing I can think of would be a travel toothbrush holder. But that would be conspicuous, which defeats our purpose. I'll think on that... and anyone who uses this kind, should think about switching!
As for OB-style, but larger of course... um. Not as sturdy as the Bonne Bell, but still an option... a paper roll for quarters (or possibly nickels)! You know the kind you roll them in, to exchange for paper money?
And our $ stores carry those lipstick cases, with the tiny mirror and just enough room for a tampon! That's what I used for a long time, until my purse got stolen a few years ago.
I'm still with the brainstorming here...
Edited to add: How about one of these?
It's an M&M's mini container. Sorry the pic is so small, I couldn't find a better one. The only drawback I can think of is having people (who don't know) ask you for some candy!