…. no matter how long or how short your hair is, you will need more conditioner than shampoo. Unless your hair is so oily you cannot use conditioner, but surely that is very rare? I would imagine that in almost all cases conditioner bottle should be larger than the shampoo bottle. Or is it just me and my mop of hair thinking that way?
I wash my hair once or twice a week. I use perhaps one tablespoon of shampoo each time, shared over a lather – rinse – repeat cycle. But conditioner I use about four tablespoons each time. In addition I condition my hair almost every single day so I go through about ten times as much conditioner as shampoo.