I made the switch to bar shampoo and conditioner. It's a great way to reduce the liquids I carry when I travel, and at home, it helps reduce plastic waste. I have learned that you can melt both shampoo and conditioner bars in the microwave. When my bars have worn down to slivers and break easily, I melt them and pour the melted mixture into silicone ice cube trays. They are more usable when recast into cubes. And they are nice for travel. If you are trying for minimalism, you can make bars that are just the size that you will use.
One warning: they melt fast in the microwave. Try 5 seconds and check how it is going, then microwave for 5 more seconds.