I see a lot of replacements for more stiff plastics that can be done another way such as the "push pop" deodorants mentioned in other comments. I'm curious wha

I see a lot of replacements for more stiff plastics that can be done another way such as the "push pop" deodorants mentioned in other comments. I'm curious what alternatives there are for squeeze bottle items (ketchup, shampoo, etc.) I know that there are alternatives (obviously ketchup comes in glass bottles) but how do you replicate the squeeze bottle with something other than plastic. Right now I have an image in my mind of a juice box full of shampoo, but I haven't actually seen any replacements like this around.