Make-up cases do work !!!
If using one, make sure if you are using rechargeable batts that you do put them in a separate battery case then.
You do NOT want batts flopping around inside a makeup case, touching other metals. Unless you like carrying a possible grenade.
I personally like my stuff with heatable coils and batteries and stuff to be locked down not touching other stuff. Clearomizers for instance, that center post could get knocked a bit and then not make good contact w/battery (as it is I"m sometimes having to pull down the center post a bit). Also, I do not like my eGo batt top to be clanking around inside a case against other stuff.