Secondhand Shopping in Singapore Through Carousell, Thrift Shops and Swap Events

Buying secondhand in Singapore feels like an automatic win for waste reduction. It is not. The outcome depends on one thing: whether your buy displaces a new one. Grab a used shirt you would not have bought new, and zero waste is prevented. Buy that same shirt instead of a new one, and you keep roughly 120 grams of textile out of the incineration plant. The categories below are ranked by the weight of waste avoided per purchase, using NEA waste composition data. Know where your Carousell click or thrift-shop visit makes the biggest difference.

Waste prevention through secondhand shopping in Singapore happens only when a used purchase displaces a new one. Consumer surveys measure this displacement rate. Studies of peer-to-peer resale platforms, cited in the Journal of Industrial Ecology, find that 30 to 40 percent of secondhand buys are additive. The buyer would not have bought the item new. For those purchases, the environmental benefit is zero. The remaining 60 to 70 percent displace a new item and prevent that item's eventual incineration or landfill disposal.

In Singapore, nearly everything not recycled is incinerated and the ash goes to Semakau Landfill. Displacement matters more here than anywhere with spare landfill space. Every new garment you skip keeps its weight out of an incineration plant that sends 15 to 20 percent of its original mass as ash to Semakau. Avoiding 1 kg of new textiles prevents roughly 0.18 kg of ash that would otherwise occupy the limited 16 million cubic metres of remaining capacity at Semakau.

Carousell secondhand environmental impact varies by product category because NEA waste statistics treat each stream separately. In 2023, Singapore generated 202,000 tonnes of textile and leather waste. Only 2 percent was recycled. The rest went to incineration. A single adult cotton T-shirt weighs roughly 150 grams before washing. Buy it secondhand on Carousell, and if it displaces a new purchase, you prevent that mass from reaching the incinerator. A single used sofa from the furniture category, at 25 to 40 kilograms, prevents far more.

Ranking by Tonnage of Waste Avoided Per Purchase

The ranking, drawn from NEA's waste composition data:

• Furniture and bulky goods: 25-40 kg per item, the highest mass avoided. A used sofa or wardrobe displaces a new one that would be incinerated as part of the 1.87 million tonnes of domestic waste generated in 2023.
• Large household appliances (washing machines, refrigerators): 40-70 kg per item. These fall under the regulated e-waste Producer Responsibility Scheme, so the new purchase would have a collection pathway for its eventual disposal. The avoided mass is still high.
• Electronics (laptops, monitors): 3-8 kg per item. Avoids the incineration pathway, but the new item would contain embodied carbon and materials rarely recycled in Singapore.
• Textiles (clothing, footwear): 0.1-0.6 kg per item. The lowest mass per purchase, but textiles are the stream with the lowest recycling rate, 2 percent. Every item that avoids incineration keeps material out of a system with almost no recovery option.

Thrift-shop clothing waste reduction in Singapore runs through several channels, each with different collection and distribution models. The largest charity operators include Salvation Army Singapore, which runs multiple thrift stores and a garment-collection bin network. MINDS Shop, operated by the Movement for the Intellectually Disabled of Singapore, sells donated clothing and household goods. New2U Thrift Shop, a social enterprise, focuses on pre-loved fashion. These shops accept donations and sell them at low prices.

The metric that matters for waste prevention is not the tonnage of donations collected. It is the proportion that displaces new purchases. Buy a shirt from Salvation Army Singapore when you would have bought a new one, and you prevent that shirt's eventual incineration. Buy it as a novelty or because it is cheap, and no waste is avoided. The same logic applies to MINDS Shop and New2U Thrift Shop.

Garment Collection Bins: Where the Unwanted Textiles Go

Garment collection bins placed by charities and private collectors are a separate pathway. The collected textiles are sorted. Wearable items go to thrift stores or are exported. Unwearable rags are sold to industrial users. The rest, contaminated or low-quality, is incinerated. The recycling rate for textiles sits at 2 percent because most garments are blended fibres that cannot be mechanically recycled. Buying secondhand from a thrift shop instead of sending your own clothes to a bin has no direct waste-reduction benefit unless you replace a new purchase.

Swap events in Singapore, organised by zero-waste groups or community centres, operate on a direct exchange model. Participants bring items they no longer want and take items others brought. No cash changes hands. The displacement principle still applies. Take a shirt from a swap when you would have bought a new one, and you avoid waste. Take a shirt you would not have bought, and no waste is prevented.

Swap events increase the utilisation rate of existing goods without the logistics of a marketplace. They keep items out of the 202,000-tonne textile waste stream even when the item does not displace a new purchase. The garment's lifespan is extended; it might otherwise have gone to a collection bin and then to incineration. The waste-avoidance tonnage per participant is low, roughly 0.2 to 0.5 kg per item exchanged.

Buying used goods for landfill avoidance in Singapore is not about every secondhand transaction. The single most practical move: treat secondhand shopping as a replacement for new purchases, not an addition to your consumption. Before you buy anything from Carousell, a thrift shop, or a swap event, ask whether you would have bought that item new. If the answer is no, your purchase does nothing for waste reduction. If the answer is yes, you keep that item's entire mass, and the ash it would produce, out of the incineration plant and off Semakau.

Choose your secondhand categories by the weight of waste you can avoid. A single used sofa prevents 25-40 kg of waste. A single used shirt prevents 0.1 kg. Both matter, but the sofa does far more for landfill avoidance. The failure case is buying secondhand items you never needed, then discarding them later. That re-enters the waste stream with no offset at all.