Their two-in-one shampoo and conditioner comes concentrated in a leak-proof TSA-approved bottle. It’s paraben free, biodegradable and comes in a green tea fragrance.
This concentrated shampoo doesn’t require additional water and is left in the hair after massaging into the scalp and towel drying.
This biodegradable formula is triple-concentrated, meaning the travel size 100 ml bottle is enough for 30 shampoos!
While the Olive & Avocado shampoo from Earth Science is not as concentrated as some others on the list, it’s still twice as concentrated as normal shampoo. It’s especially good for damaged, dry, or curly hair.
While not concentrated shampoo, this all-natural soap doesn’t require much to get the job done and comes in a TSA-approved bottle size.
Lush makes shampoo bars that are also concentrated, leaving behind the excess water and lasting as long as two to three bottles of shampoo. They’re made of natural ingredients and are vegan-friendly.