I have to say the purple caps need to go. Don't get me wrong but they leak and don't fit right every time I pick one up they have liquid on the side.
It's been a struggle with the enclosures for glass. We're in the middle of planning the following transition...
Dumping the glass and moving to purple tinted PET bottles, all with droppers (we're actually exploring the softer pet bottles with the old 'thin' tops)
Pushing Unicorn bottles hard for the bottles that have flat caps - 30ml and 60ml bottles with flat caps are not intended to be tossed in a purse or a pocket.
The good news is that the contents of the bottle is outstanding - we are also not pleased with the enclosures (although the purple caps are MUCH better than the black ones we started with!)