Shampoo bars—hair cleanser in bar soap form—are the latest trend in hair care products. Usually made of natural ingredients to promote hair health, they’re also easier on the environment and great for travel. Here are five reasons to make the switch from bottle to bar.

This story is part of Planet or Plastic?—our multiyear effort to raise awareness about the global plastic waste crisis. Learn what you can do to reduce your own single-use plastics, and then head here to take your pledge.

Reduction of Plastics

Currently, about nine million tons of plastic get thrown into the ocean annually, which breaks down to one garbage truck full of plastic being dumped into the sea every minute. Shampoo bars cut out the need for plastic bottles, and most come wrapped in recycled paper or in paper boxes. They’re also convenient for travelling—just pop them in a metal tin available for that purpose.

No Worries About TSA Limits

A traveller’s nightmare is having airport security raid your bag, asking if you’re over the liquid limit, or worse, opening your suitcase after a flight and finding out that your shampoo bottles have leaked all over your favourite outfit. Shampoo bars eliminate both scenarios and will make your case smell good, without destroying your clothes.

Concentrated to Last Longer

Most shampoos are 80-percent water and conditioners can be even more—up to 95-percent water. Why pay for water when you can add it in yourself? Shampoo bars are mega concentrated and generally last longer than bottled versions. On average, a shampoo bar will outlast two to three bottles of liquid shampoo, meaning you save money and extra trips to the store.

Cruelty Free and All Natural

Many brands that produce shampoo bars are striving to protect the oceans, wildlife, and ecosystems that are being affected by the mass production of chemical-laden products in the beauty industry. Many traditional bottled shampoos are filled with preservatives and chemicals that can strip hair of its natural oils and leave your scalp feeling dry. Oftentimes, these chemicals are not found in shampoo bars. Many bars contain essential oils and natural ingredients and are cruelty free. Another plus? Many shampoo bars are free of palm oil, an ingredient linked to deforestation and habitat degradation.