On a beach on Henderson Island — an uninhabited speck of land in the South Pacific, roughly 5,000 kilometres from the nearest city — scientists counted 37.7 million pieces of plastic in 2017. Nobody had put them there intentionally. They arrived on ocean currents, gathered across decades, and settled on sand that had never seen a human footprint. The island had the highest density of plastic debris recorded anywhere on Earth at the time. That figure comes from a peer-reviewed study published in the Proceedings of the National Academy of Sciences.
It is not an abstract statistic. It is a useful starting point for understanding what we mean when we ask how long plastic actually lasts.
The short answer
Most plastic items take between 20 and 500 years to break down in a landfill, depending on the polymer type and conditions. A standard plastic deodorant stick container — typically made from polypropylene or HDPE — takes roughly 450 years. In the oxygen-deprived, light-blocked interior of a landfill, that timeline may be effectively indefinite: the plastic does not biodegrade, it fragments into microplastics that persist in soil and water for far longer.
What actually happens to plastic in a landfill?
Biodegradation needs oxygen, moisture, light, and microbial activity. A properly managed landfill — designed to contain leachate and limit environmental spread — inadvertently creates the worst possible conditions for decomposition. Plastic is buried under thousands of tonnes of compacted waste. Without UV exposure, photodegradation stalls. Without oxygen, microbial breakdown is minimal.
What does happen is fragmentation. Over decades, physical stress and residual heat cause larger plastic items to crack and shed particles. These particles — microplastics under 5mm in diameter — do not disappear. They migrate through the landfill body, leach into groundwater, and eventually travel into rivers and coastal water. A DEFRA-funded study published in 2024 found that landfill leachate across 17 UK sites contained persistent chemical pollutants (PFAS) at concentrations up to 87,100 nanograms per litre, with 80% of sites showing contamination that increased after treatment rather than decreased.
The plastic container you discard today will still be releasing chemical fragments into the soil when your great-great-grandchildren are alive.
The breakdown timeline by plastic type
Not all plastic is equal. These are realistic decomposition estimates — though in a sealed landfill, these figures represent the minimum plausible timescale:
- Plastic bag (LDPE) — 10 to 20 years (fragments into microplastics; does not vanish)
- Plastic straw (PP) — approximately 200 years
- Plastic bottle (PET) — approximately 450 years
- Deodorant stick container (PP/HDPE) — approximately 450 years
- Disposable nappy — 450 to 500 years
- Fishing line (nylon) — up to 600 years
- Expanded polystyrene — 500 years or more; no confirmed full decomposition
The figure for a deodorant container sits at roughly 450 years, comparable to a standard plastic bottle. Most mainstream brands use polypropylene for the outer casing and HDPE for the inner mechanism. Neither degrades cleanly under landfill conditions.
The scale of what we are producing
These timelines matter because of volume. The world produces more than 430 million tonnes of plastic every year, according to UNEP. Of that, packaging accounts for 36% — the single largest use category. Only an estimated 9% of all plastic ever produced has been recycled.
Every year, an estimated 19 to 23 million tonnes of plastic waste enters aquatic ecosystems — lakes, rivers, and seas — according to UNEP's 2021 assessment. That is roughly 40 to 50 kilograms entering water every single second.
The consequences accumulate visibly. The Great Pacific Garbage Patch — the largest of the ocean's five major accumulation zones — covers approximately 1.6 million square kilometres, according to an analysis published in Scientific Reports by The Ocean Cleanup Foundation in 2018. It contains at least 79,000 tonnes of plastic. The majority is not shopping bags. It is fragments of durable consumer goods: fishing gear, containers, packaging that was never designed to be in the sea but had nowhere else to go.
What plastic pollution does to wildlife
The 2021 X-Press Pearl disaster off the coast of Sri Lanka offers a precise case study in how plastic enters marine food chains. When the cargo vessel caught fire 18 kilometres from Colombo, it released approximately 1,680 tonnes of nurdles — the preproduction plastic pellets used to manufacture almost every plastic product on earth. It became the largest nurdle spill ever recorded. Within five days, pellets had reached Sri Lankan beaches. Marine ecologists documented contamination across fishing zones and coastal ecosystems, and Sri Lanka sought $7 billion in environmental damages.
Nurdles look like fish eggs. Seabirds, fish, and marine invertebrates ingest them. The consequences compound up the food chain.
Seabird exposure is particularly well-documented. Research by CSIRO — Australia's national science agency — published in PNAS found that 90% of individual seabirds had ingested plastic as of 2015, up from under 5% in 1960. The same study projected that 99% of all seabird species will have plastic in their gut by 2050 if current trends continue. Albatrosses feed plastic fragments to their chicks. These are not isolated incidents; they are the baseline.
What this means for everyday products — including deodorant
Most people don't think about their deodorant packaging beyond the moment they throw it away. That's understandable. The container is finished, it goes in the bin, and that's the end of the story as far as daily life is concerned.
But the container doesn't end. The average person gets through roughly eight to twelve deodorant sticks a year. Over a lifetime of use, that is 500 to 900 individual plastic containers per person — each one destined to outlast the user by several centuries.
The UK generates approximately 2.5 million tonnes of plastic waste annually, according to data from the House of Commons Library. Deodorant packaging alone represents millions of units of polypropylene and HDPE entering the waste stream every year. Most of it is not recyclable through kerbside collection — the mix of polymers and product residue makes it unsuitable for standard processing.
Once a single-use plastic deodorant container is manufactured, the environmental cost is largely irreversible. Recycling is the best available outcome, but it is uncommon for this product category. Landfill is the dominant endpoint.
What you can actually do about it
The pollution lane on this blog exists because the numbers are clear enough that informed decisions become straightforward ones. Here is where the leverage is:
- Switch to a refillable deodorant. A lifetime applicator — used once, refilled indefinitely — eliminates hundreds of single-use containers over decades. Lifelong's refillable system cuts transport emissions by up to 94% compared to shipping conventional single-use sticks.
- Choose packaging that composts, not just bins. Compostable pouches return to the soil within months. A plastic wrapper persists for centuries.
- Support brands that actively remove plastic, not just avoid adding it. There is a meaningful difference between using slightly less plastic and funding physical ocean plastic removal.
- Understand recycling limits. Mixed-polymer deodorant containers are rarely accepted through household kerbside collection. Check with your local authority before assuming the recycling symbol means it will be processed.
- Favour formulas that actually last. A longer-lasting natural deodorant means fewer containers over time, regardless of format.
Why Lifelong exists
Lifelong was built on a straightforward premise: the single-use deodorant container is one of the most unnecessary pieces of recurring plastic waste in a bathroom. There is no functional reason a deodorant needs a new plastic casing every time it runs out.
The Lifelong Vibes applicator is made from 100% ocean-bound recycled plastic, reclaimed from coastal communities before it reaches the sea, through our partner TIDE. It is designed to be refilled, washed, and used again — indefinitely. Refills arrive in 100% compostable pouches. No single-use plastic in the supply chain.
For every applicator sold, Lifelong removes 1kg of plastic from the ocean through our Seven Clean Seas partnership. That is a verified programme with physical removal data attached to every unit sold.
The problem outlined in this article is large. Individual choices don't solve systemic production volumes. But 37.7 million pieces of plastic on an uninhabited island arrived one piece at a time. The accumulation runs in both directions.
Frequently Asked Questions
How long does plastic take to break down in landfill?
Most common plastics take between 200 and 500 years to fragment under landfill conditions. A plastic deodorant container made from polypropylene or HDPE takes approximately 450 years. Even then, it does not fully disappear — it breaks into microplastics that persist in soil and groundwater for far longer.
Does plastic actually biodegrade?
Standard petroleum-based plastics do not biodegrade in any meaningful sense. They fragment through UV exposure and physical stress into progressively smaller particles, but the chemical compounds remain. True biodegradation — where microorganisms fully break down a material — does not occur for conventional plastics, particularly in the oxygen-restricted conditions of a landfill.
Is plastic in landfill worse than plastic in the ocean?
Both cause serious harm through different pathways. Landfill plastic leaches chemical pollutants into groundwater and soil over centuries. Ocean plastic breaks up faster due to UV exposure and wave action, creating microplastics that enter food chains rapidly. Landfill is not a safe disposal route — it is a slow-release environmental problem, not a solution.
How much plastic enters the ocean every year?
UNEP estimates that 19 to 23 million tonnes of plastic waste enters aquatic ecosystems annually — covering lakes, rivers, and seas. That figure has grown consistently year on year alongside global plastic production, which exceeded 430 million tonnes in 2024.
What is ocean-bound plastic?
Ocean-bound plastic is waste collected from coastal communities and waterways before it reaches the sea — typically within 50 kilometres of a coastline. It represents plastic that would otherwise have entered the ocean due to inadequate local waste infrastructure. Lifelong Vibes is made from 100% ocean-bound recycled plastic reclaimed through the TIDE programme.
