The consistency of cream soap is fairly thick, thicker than either. I package it in tubs (low profile jars). The other thing I'm going to try is to put them into a tube like you would find in a drugstore with the ends crimped.
LOL - let us know your experience. I learned that it was condensation that caused my problem. Preservative wouldn't have stopped that because preservative doesn't immigrate with the condensation.
Go to http://swiftcraftymonkey.blogspot.ca/2015/04/im-presenting-at-conference-for.html and do some searching, she has a lot of stuff on shampoo and conditioners.