One concentrated, plastic free shampoo bar from The Earthling Co. replaces roughly two to three standard 8-ounce plastic bottles of liquid shampoo. Because traditional liquid shampoo is composed of approximately 80% water, it requires heavy plastic packaging and high shipping fuel to move from the factory to your shower. A single 3 oz solid bar eliminates this water filler entirely, delivering between 50 and 75 washes (which can stretch to 80+ washes with dry storage). Across a year of washing, making the simple swap to a zero waste shampoo can keep up to 9-12 plastic bottles out of our oceans and landfills per person.
The math: Exactly how many bottles are replaced per bar?
To understand how a single 3 ounce solid bar can replace several heavy bottles of liquid shampoo, we have to look closely at the physical mechanics of how we wash our hair.
When you use conventional liquid shampoo, you are handling a highly diluted product. Because liquid runs easily off your palms, it is incredibly easy to over-pour. The average person uses significantly more liquid shampoo than chemically necessary per wash, resulting in about 25 to 30 washes per standard 8 ounce bottle.
A premium, pH-balanced syndet shampoo bar is formulated without any water filler. Because it is solid, you cannot over-pour it. You only transfer the exact amount of active, plant-derived surfactants needed by rubbing the bar between your wet hands or swiping it gently down your hair fibers.
When we calculate the usage rates, the math becomes clear:
Average Liquid Bottle = approx 25 to 30 washes
One Earthling Co. Bar = approx 50 to 75 washes
By optimizing your lathering technique, one bar comfortably matches the lifespan of 2 to 3 standard liquid bottles. With proper care, such as allowing the bar to dry completely between uses, you can easily stretch a single bar to 80+ washes. This means a single, palm-sized bar can support your hair care routine for 2 to 6 months, depending on your hair length, thickness, and wash frequency.
The Big Shampoo water trap: Why liquid is mostly water
To understand why traditional hair care brands package their formulas in heavy plastic jugs, we have to examine the manufacturing blueprint of conventional cosmetics. For decades, major beauty conglomerates have operated on a highly profitable commercial model: selling water.
Water is the cheapest solvent available. By diluting active surfactants, conditioning agents, and botanical extracts with up to 80% water, manufacturers can create large, visually impressive bottles that feel substantial on a store shelf. This dilution is necessary for the product to pour easily from a bottle, but it creates a massive packaging trap.
Because water cannot support its own weight or maintain structural integrity, it requires a rigid, waterproof container. Cheap, single-use petrochemical plastics became the industry standard because they are lightweight, durable, and highly cost-effective to produce.
However, this commercial convenience carries an enormous environmental deficit:
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The Recycling Illusion: According to global recycling data, only 9% of all plastic ever created has actually been recycled. The remaining 91% has either been incinerated (releasing toxic chemicals into the atmosphere), buried in landfills, or lost to natural ecosystems.
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The Landfill Lifespan: A standard high-density polyethylene (HDPE) or polyethylene terephthalate (PET) shampoo bottle takes up to 450 years to decompose. Even then, it never truly disappears; it simply fragments into toxic microplastics that contaminate our soil, municipal water systems, and marine food chains.
By choosing an eco friendly shampoo bar, you bypass this water trap entirely. You simply use the water already flowing from your showerhead to activate the concentrated botanical cleansers.
Scaling it up: The annual and household impact
To appreciate the cumulative power of this small daily swap, let's scale the mathematical calculations from a single washing session to a full year of consumer habits.
For One Person
The average individual washes their hair roughly 3 times per week, totaling approximately 150 washes per year.
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Using liquid shampoo: This individual will consume and discard approximately 5 to 6 plastic bottles of shampoo annually.
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Using a zero waste shampoo bar: This same individual will only require 2 to 3 solid bars per year, completely eliminating those plastic bottles from their waste footprint.
For a Household of Four
In a household of four, the environmental savings scale up rapidly. A family of four typically consumes and discards between 20 and 24 plastic shampoo bottles every single year.
By transitioning the entire household to solid bars, a family can keep over 20 single-use plastic bottles out of the waste stream annually. When you add matching solid conditioner bars into the equation, that number instantly doubles, saving up to 40 to 48 plastic bottles from entering local landfills each year.
Beyond the bottle: The hidden carbon and shipping footprint
The environmental benefits of a plastic free shampoo extend far beyond the physical bottle itself. To get a complete picture of the ecological savings, we must calculate the carbon logistics of transporting liquid products versus waterless solids.
Because liquid shampoo is composed of 80% water, it is incredibly heavy and bulky. Shipping these heavy liquid bottles requires immense energy throughout the global supply chain:
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Cargo Space Volume: A standard shipping crate that can fit 100 liquid shampoo bottles can easily hold upwards of 400 to 500 concentrated, space-saving shampoo bars.
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Transport Weight: Water is incredibly heavy, weighing 1 gram per cubic centimeter. Shipping waterless solids eliminates this dead weight entirely. A single shipping truck loaded with solid shampoo bars carries the washing equivalent of 3 to 4 trucks loaded with heavy, water-diluted liquid bottles.
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Carbon Emissions: By drastically reducing the physical volume and weight of the cargo, solid bars require fewer trucks on the road, lower fuel consumption, and a dramatic reduction in greenhouse gas emissions.
Furthermore, our shampoo bars are wrapped in 100%plastic-free, recyclable, and home-compostable paper packaging. The boxes are sealed with natural starch-based adhesives, ensuring that from production to shipping to disposal, the product leaves absolutely zero waste behind.
How our bars add up: The Earthling Co. footprint
At The Earthling Co., our mission is to create high-performance alternatives that make sustainable living effortless. To date, we have helped our community prevent over 3,000,000 plastic bottles from entering our landfills and oceans through our solid hair care line.
We have achieved this impact without asking our customers to compromise on salon-quality results. Our dermatologist-tested, pH-balanced syndet bars are formulated to cater to specific hair needs, using premium plant-derived ingredients instead of synthetic fillers:
The Volumizing Shampoo Bar
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Best for: Fine, thin, flat, or easily weighed-down strands.
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The Formula: Infused with gentle, coconut-derived cleansers, marshmallow root extract, and Vitamin B5 (Panthenol).
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The Performance: Clinically shown to increase hair volume by up to 85% and natural shine by up to 89%. It lifts away excess sebum and stubborn liquid silicone buildup while leaving hair feeling lightweight and full of natural bounce.
The Moisturizing Shampoo Bar
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Best for: Thick, coarse, curly, dry, or chemically treated hair.
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The Formula: Packed with rich, nourishing organic plant oils and butters, including coconut oil, raw cocoa butter, and argan oil.
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The Performance: This deeply hydrating bar delivers essential fatty acids directly to the hair cuticle, sealing in moisture, smoothing out frizz, and providing excellent wet slip to prevent breakage during combing.
The Fragrance-Free Shampoo Bar
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Best for: Sensitive scalps, easily irritated skin, or those who prefer a completely scent-free routine.
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The Formula: Formulated without essential oils, masking agents, or synthetic fragrances, prioritizing ultra-mild, plant-derived cleansers and soothing botanicals.
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The Performance: Hypoallergenic and dermatologist-tested, it delivers a gentle, deeply comforting cleanse that respects the natural scalp barrier. It effectively lifts away impurities without triggering redness or flaking, leaving hair soft, balanced, and completely refreshed.
By shifting your daily routine to these clean, zero-waste alternatives, you upgrade your hair care to a botanical, skin-first system while actively contributing to a cleaner, plastic-free planet.
Maximizing your plastic-free investment: Storage tips
Because premium syndet shampoo bars contain absolutely zero synthetic chemical hardening agents, they are naturally sensitive to continuous moisture. If left sitting in a puddle of water on your tub ledge, your bar will absorb water, soften, and dissolve far too quickly down the drain.
To protect your investment and ensure your bar lasts for its full 75+ wash lifespan, follow these simple storage guidelines:
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Avoid the "Splash Zone": Store your bar in a corner of your shower that stays completely dry during your rinse. Keep it away from the direct spray of the showerhead.
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Prioritize Drainage: Never store your bar on a flat, solid porcelain ledge. Instead, place it on a raised, slotted soap dish or in our sustainable, self-draining Shower Caddy. Our caddy elevates the bars, allowing maximum airflow to dry them from the bottom up between uses.
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The Old Meets New Trick: When your shampoo bar eventually wears down to a thin, fragile sliver, do not discard it. Wet both your old sliver and a brand-new bar, press the old piece firmly onto the top of the new bar, and let them dry together overnight. They will fuse into a single unit, ensuring you use every single gram of active product.
Using a high-quality, slotted draining caddy prevents mushiness and keeps your bar firm, clean, and intact—extending its lifespan by up to 3x and saving you more money in the long run.
Shampoo Bar Environmental FAQ
Do shampoo bars actually save money compared to liquids?
Absolutely. While a high-quality shampoo bar might have a slightly higher upfront cost than a cheap drugstore bottle of liquid, it is far more economical over time. Because a single bar lasts as long as 2-3 standard liquid bottles, your annual cost per wash is significantly lower.
What happens to the packaging of a shampoo bar?
Our bars are packaged in $100\%$ plastic-free, recyclable, and home-compostable paper boxes. If you have a backyard compost bin, you can place the box directly inside, and it will safely biodegrade back into the soil within a few weeks without leaving behind any synthetic residues.
Why do some shampoo bars leave a waxy residue?
A waxy residue is typical of cheap, DIY, or traditional "soap-based" shampoo bars made from saponified vegetable oils. These carry a highly alkaline pH of 9.0 to 10.0, which reacts with water minerals to create soap scum on your hair. Premium bars like ours are syndet bars, precisely engineered to match your scalp's natural 4.5 to 5.5 pH, ensuring they rinse completely clean.
Are these bars safe for grey or color-treated hair?
Yes, they are highly recommended. Because they do not contain harsh stripping agents like Sodium Lauryl Sulfate (SLS), they cleanse color-treated, bleached, or grey hair incredibly gently. This helps preserve your salon color and natural pigments, preventing brassiness and extending the time between color touch-ups.
