I opted for a Sample Society box because it's deeper than the Birchbox boxes and I wanted the lip glosses to have more support. It's not that prettiest craft project ever but I took the sides off the lid and made dividers. I just glued these down with a hot glue gun.
There's also plenty of space left if I were to ever clean out my purse! This was a quick and easy project. I didn't measure anything. I just eyeballed the length to cut the dividers. Perhaps, one day I'll get inspired to redo this and clean it up a bit. For now though, it's a vast improvement.